Economics,
one step at a time.

Working and reasoning: Flats can remain scarce even at equilibrium, while a rent ceiling can create a market shortage because quantity demanded then exceeds quantity supplied. This follows because Scarcity is the permanent condition of limited resources relative to wants; a shortage is quantity demanded exceeding quantity supplied at a stated price and time. Reject the alternative claim that Scarcity and shortage both mean that quantity demanded exceeds quantity supplied at the current price.

Watch for: Do not stop after the first effect of Economics, scarcity and economic goods. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Choosing between a wetland and housing requires valuing flood protection and biodiversity as well as market revenue. This follows because Opportunity cost clarifies trade-offs, but measurement is difficult when alternatives have uncertain, non-market, changing or differently distributed benefits and costs. Reject the alternative claim that Opportunity cost gives an objective cash value for every rejected alternative without uncertainty or judgement.

Watch for: Do not stop after the first effect of Choice, opportunity cost and interest. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A firm can cut unit cost and become more productively efficient while a monopoly output remains allocatively inefficient because price exceeds marginal cost. This follows because Productive efficiency means producing at the lowest feasible average cost; allocative efficiency means producing the mix and quantity that best matches preferences, commonly where price equals marginal cost. Reject the alternative claim that Productive efficiency and allocative efficiency are interchangeable because both simply mean earning maximum profit.

Watch for: Do not stop after the first effect of Basic economic problems and private property rights. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: An assembly plant assigning workers to particular production stages may raise output per hour but make work repetitive and create dependence between stages. This follows because Specialisation lets workers or economies concentrate on narrower tasks, potentially raising productivity through skill, repetition and less switching. Reject the alternative claim that Division of labour always removes interdependence because each worker produces a complete product alone.

Watch for: Do not stop after the first effect of Specialisation, circular flow and economic statements. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Share-based remuneration may align managers with owners, whereas a small firm facing entry may need normal profit simply to keep resources employed. This follows because The importance of the principal-agent problem and alternative objectives depends on ownership, competition, finance, time horizon and incentive contracts. Reject the alternative claim that Every firm can pursue any objective regardless of ownership, competition or long-run viability.

Watch for: Do not stop after the first effect of Firm ownership, liability, shares and bonds. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Fishing is primary, canning fish is secondary and transporting the cans to retailers is tertiary production. This follows because Primary production extracts natural resources, secondary production transforms materials and tertiary production supplies services; the stages depend on one another. Reject the alternative claim that Retailing is secondary production because it occurs after a good has been manufactured.

Watch for: Do not stop after the first effect of Stages of production and types of goods. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Retraining helps declining-industry workers move occupation, while high housing cost may still prevent movement to vacancies elsewhere. This follows because Occupational, geographical, numerical, functional and wage flexibility can improve adjustment, but training cost, housing, family ties, insecurity and unequal bargaining power can limit gains. Reject the alternative claim that Labour mobility is determined only by the wage difference between two jobs.

Watch for: Do not stop after the first effect of Division of labour. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Retraining helps declining-industry workers move occupation, while high housing cost may still prevent movement to vacancies elsewhere. This follows because Occupational, geographical, numerical, functional and wage flexibility can improve adjustment, but training cost, housing, family ties, insecurity and unequal bargaining power can limit gains. Reject the alternative claim that Labour mobility is determined only by the wage difference between two jobs.

Watch for: Do not stop after the first effect of Factors of production. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A restaurant's premises may be fixed this month, but relocation and redesign become possible over a longer planning horizon. This follows because The short run has at least one fixed factor, while in the long run all factors are variable; the distinction depends on adjustment possibilities rather than a fixed calendar period. Reject the alternative claim that The short run always lasts exactly one year for every industry.

Watch for: Do not stop after the first effect of Short-run production and cost schedules. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A larger plant may spread indivisible machinery cost but later suffer slower communication and weaker managerial control. This follows because Long-run average cost falls with economies of scale and rises with diseconomies; causes may be technical, purchasing, financial, managerial or coordination-related. Reject the alternative claim that Economies of scale are caused by changing a variable factor while at least one factor remains fixed.

Watch for: Do not stop after the first effect of Scale, expansion and integration. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A social enterprise may retain a loss-making community service because provision, rather than maximum profit, is part of its objective. This follows because A firm may pursue a larger market share or provide services that do not make a profit, subject to finance and survival constraints. Reject the alternative claim that Every firm must maximise current profit and cannot rationally pursue market share or service provision.

Watch for: Do not stop after the first effect of Objectives of firms and price-taking profit. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: An increase in consumer preference for rail travel shifts rail demand right even if the fare has not changed. This follows because A non-price determinant such as income, tastes, population or a related good's price shifts demand at every own-price level. Reject the alternative claim that A fall in the product's own price shifts demand right rather than causing an extension along the curve.

Watch for: Do not stop after the first effect of Individual and market demand. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A rise in fertiliser cost shifts crop supply left because producing each quantity is less profitable at the previous prices. This follows because Costs, productivity, technology, taxes, subsidies and producer numbers can shift supply at every price. Reject the alternative claim that A fall in the product's own price shifts supply left rather than causing a contraction along supply.

Watch for: Do not stop after the first effect of Individual and market supply. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A sharp rise in petrol prices can shift demand toward rail travel while also raising delivery costs and shifting supply left in transport-intensive markets. This follows because A shock in one market can alter demand or supply in related markets through complementarity, substitution or shared inputs. Reject the alternative claim that Related markets can interact only when the two goods are bought in the same transaction.

Watch for: Do not stop after the first effect of Market equilibrium and changes. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A demand increase raises equilibrium price and usually enlarges producer surplus, but the change in consumer surplus is ambiguous because price and quantity move in opposite welfare directions. This follows because A price change redistributes surplus between buyers and sellers and changes traded quantity, so its total welfare effect depends on the cause and any market failure. Reject the alternative claim that Any rise in market price must reduce total economic surplus because every consumer pays more.

Watch for: Do not stop after the first effect of Economic surplus and functions of prices. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A fare cut raises total revenue only if the percentage increase in journeys exceeds the percentage price fall. This follows because When demand is price elastic, price and total revenue move in opposite directions; when demand is inelastic, they move in the same direction. Reject the alternative claim that A price increase always raises total revenue because revenue per unit is higher.

Watch for: Do not stop after the first effect of Price elasticity of demand and supply. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: With inelastic but not perfectly inelastic demand, firms can pass through much, but not necessarily all, of a tax through a higher consumer price. This follows because Tax incidence depends on relative PED and PES; consumers bear all of a per-unit tax only in the limiting case of perfectly inelastic demand with ordinary upward supply. Reject the alternative claim that Firms always pass the entire tax to consumers because the tax is legally collected from sellers.

Watch for: Do not stop after the first effect of Price, quantity, tax and subsidy intervention. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Many sellers with differentiated products and relatively easy entry approximates monopolistic competition, not perfect competition. This follows because Market structures are theoretical constructs compared by seller and buyer numbers, product nature, entry, information and whether firms take or search for price. Reject the alternative claim that A market must be a physical place, and any market with many buyers is automatically perfectly competitive.

Watch for: Do not stop after the first effect of Competitive and imperfectly competitive markets. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A firm can cut unit cost and become more productively efficient while a monopoly output remains allocatively inefficient because price exceeds marginal cost. This follows because Productive efficiency means producing at the lowest feasible average cost; allocative efficiency means producing the mix and quantity that best matches preferences, commonly where price equals marginal cost. Reject the alternative claim that Productive efficiency and allocative efficiency are interchangeable because both simply mean earning maximum profit.

Watch for: Do not stop after the first effect of Efficiency, intervention and deadweight loss. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Industrial noise is a negative production externality; second-hand smoke is a negative consumption externality; worker training can create positive production spillovers. This follows because External costs or benefits can arise from production or consumption, and the relevant social-private marginal curve differs with the source of the spillover. Reject the alternative claim that Every negative externality is caused by production and every positive externality by consumption.

Watch for: Do not stop after the first effect of Private-social divergence and solutions. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Rising asset prices can widen wealth inequality when ownership is concentrated even if wage dispersion is unchanged. This follows because Inequality can arise from education, technology, inheritance, asset ownership, labour-market power, discrimination, household structure and tax-benefit policy. Reject the alternative claim that Income inequality is caused only by differences in individual effort.

Watch for: Do not stop after the first effect of Income inequality, Lorenz curves and the Gini coefficient. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A targeted benefit can raise low incomes yet a sharp withdrawal rate may weaken incentives at a particular income range. This follows because Redistribution may reduce poverty and improve opportunity, but design can affect work, saving, administration and fiscal cost; efficiency and equity effects depend on rates, thresholds and services. Reject the alternative claim that Any fall in inequality must reduce economic growth by exactly the same proportion.

Watch for: Do not stop after the first effect of Equity policies, incentives and efficiency. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: If price at that output exceeds average cost, the price-cost rectangle measures supernormal profit. This follows because A profit-maximising monopoly selects output where rising MC equals MR and then charges the price on its downward-sloping average-revenue curve. Reject the alternative claim that A monopoly maximises profit by setting price equal to marginal revenue at the largest possible output.

Watch for: Do not stop after the first effect of Simple monopoly pricing and efficiency. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: An airline may charge time-sensitive business travellers more when their demand is less elastic and resale between passengers is prevented. This follows because Price discrimination charges different prices not explained by cost differences and requires market power, separable customer groups and limited resale. Reject the alternative claim that Charging more for a service that genuinely costs more to provide is necessarily price discrimination.

Watch for: Do not stop after the first effect of Price discrimination. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A cartel quota may support price until one member secretly expands sales, reducing the collective restriction. This follows because Collusion can raise joint profit by restricting output and raising price, but agreements may be illegal and unstable because each member has an incentive to cheat. Reject the alternative claim that Collusion always benefits consumers because firms eliminate duplicated competition.

Watch for: Do not stop after the first effect of Anti-competitive agreements, mergers and impacts. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Clear price comparison can aid switching, whereas blocking an anti-competitive merger addresses structural market power. This follows because Competition policy can address market power, while information measures address knowledge failures; choosing the wrong instrument leaves the underlying failure intact. Reject the alternative claim that Publishing information automatically removes barriers to entry and prevents every merger.

Watch for: Do not stop after the first effect of Hong Kong Competition Ordinance. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Training that raises economy-wide labour productivity can shift the PPC outward, whereas destruction of capital in a disaster can shift it inward. This follows because An outward PPC shift represents greater productive potential caused by more resources, better resource quality or technological progress; an inward shift represents lost capacity. Reject the alternative claim that A rise in demand automatically shifts the PPC outward because firms want to sell more.

Watch for: Do not stop after the first effect of Trade theory, PPFs and globalisation. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Market-exchange-rate GDP can understate local purchasing power where non-traded services are relatively cheap. This follows because Cross-country comparisons must consider purchasing-power adjustment, population, data reliability, exchange rates, base effects and non-economic outcomes. Reject the alternative claim that The country with larger nominal GDP necessarily gives every resident a higher material standard of living.

Watch for: Do not stop after the first effect of Measuring growth and development. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Using idle factories raises current output; building productive infrastructure can also expand future potential output. This follows because Short-run growth is movement toward existing capacity, often from higher AD, whereas long-run growth is an increase in productive capacity represented by an outward PPC or rightward LRAS shift. Reject the alternative claim that Every movement from recession toward full employment shifts LRAS right.

Watch for: Do not stop after the first effect of Factors and policies affecting growth. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Productivity-led renewable investment may have different welfare effects from debt-fuelled consumption growth near capacity. This follows because Growth can raise income, employment and tax revenue but may increase pollution, depletion, inequality or instability; evaluation depends on source, distribution and sustainability. Reject the alternative claim that Higher GDP necessarily improves welfare equally for every resident.

Watch for: Do not stop after the first effect of Growth, living standards and sustainability. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A dealer's current service margin on a used car enters GDP, but the car's earlier production value is not counted again. This follows because GDP includes current production by resident producing units and excludes pure transfers, second-hand sales and intermediate inputs already embodied in final output; value added prevents double counting. Reject the alternative claim that Every transfer payment and the full resale price of every used asset measure current production.

Watch for: Do not stop after the first effect of GDP concepts, components and measurement. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Market-exchange-rate GDP can understate local purchasing power where non-traded services are relatively cheap. This follows because Cross-country comparisons must consider purchasing-power adjustment, population, data reliability, exchange rates, base effects and non-economic outcomes. Reject the alternative claim that The country with larger nominal GDP necessarily gives every resident a higher material standard of living.

Watch for: Do not stop after the first effect of Nominal, real, per-capita GDP and GNI. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Market-exchange-rate GDP can understate local purchasing power where non-traded services are relatively cheap. This follows because Cross-country comparisons must consider purchasing-power adjustment, population, data reliability, exchange rates, base effects and non-economic outcomes. Reject the alternative claim that The country with larger nominal GDP necessarily gives every resident a higher material standard of living.

Watch for: Do not stop after the first effect of Uses and limitations of national-income data. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: An imported consumer good can affect CPI but not the GDP deflator directly because it is not domestic production. This follows because CPI tracks prices of a consumer basket using consumer-expenditure weights, while the GDP deflator covers domestically produced final output and has changing composition. Reject the alternative claim that CPI and the GDP deflator always cover exactly the same goods with identical fixed weights.

Watch for: Do not stop after the first effect of CPI, GDP deflator and inflation. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Market-exchange-rate GDP can understate local purchasing power where non-traded services are relatively cheap. This follows because Cross-country comparisons must consider purchasing-power adjustment, population, data reliability, exchange rates, base effects and non-economic outcomes. Reject the alternative claim that The country with larger nominal GDP necessarily gives every resident a higher material standard of living.

Watch for: Do not stop after the first effect of Unemployment, underemployment and Hong Kong trends. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Households expecting unemployment may raise precautionary saving even when current disposable income is unchanged. This follows because Consumption depends on disposable income as well as wealth, credit conditions, interest rates and expectations; the average and marginal propensities describe different relationships. Reject the alternative claim that Consumption is always a fixed proportion of current income, so expectations cannot shift it.

Watch for: Do not stop after the first effect of Aggregate demand. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A sharp imported-energy cost increase can raise inflation and unemployment simultaneously. This follows because A leftward SRAS shift creates cost-push inflation and lower real output, producing a trade-off that demand management alone may not resolve. Reject the alternative claim that Cost-push inflation is represented by a rightward AD shift because households spend more on energy.

Watch for: Do not stop after the first effect of Short-run and long-run aggregate supply. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Expansionary fiscal policy during recession can raise output substantially; the same demand boost at capacity may be mainly inflationary. This follows because A rise in AD usually raises real output and the price level in the short run, but the size of each change depends on spare capacity and supply responsiveness. Reject the alternative claim that A rightward AD shift must raise real output by the same amount in every economy.

Watch for: Do not stop after the first effect of AD-AS equilibrium, output, prices and employment. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Emergency liquidity to a solvent bank facing a temporary run can limit contagion, but lending to an insolvent bank creates moral-hazard and fiscal concerns. This follows because A central bank conducts monetary policy, issues currency, manages reserves, supports payment systems and may act as lender of last resort and supervisor, depending on the institutional framework. Reject the alternative claim that Lender of last resort means permanently financing every loss-making financial institution.

Watch for: Do not stop after the first effect of Money and bank functions. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A financial institution's authorisation category determines the deposit business it may accept; the labels are not interchangeable. This follows because Hong Kong distinguishes licensed banks, restricted licence banks and deposit-taking companies by the deposits and banking business they may conduct; central-banking functions are performed through Hong Kong's institutional framework. Reject the alternative claim that Every deposit-taking institution in Hong Kong has identical powers and is automatically the central bank.

Watch for: Do not stop after the first effect of Hong Kong financial institutions and central banking. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Easier central-bank liquidity may support lending, yet broad money need not expand strongly if banks or creditworthy borrowers remain unwilling. This follows because Changing reserve conditions, asset holdings or policy operations can influence money and credit, but broad money also responds endogenously to bank lending, repayment and credit demand. Reject the alternative claim that The central bank fixes broad money exactly by printing the same number of banknotes as every new bank loan.

Watch for: Do not stop after the first effect of Money supply, reserves and credit creation. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Easier central-bank liquidity may support lending, yet broad money need not expand strongly if banks or creditworthy borrowers remain unwilling. This follows because Changing reserve conditions, asset holdings or policy operations can influence money and credit, but broad money also responds endogenously to bank lending, repayment and credit demand. Reject the alternative claim that The central bank fixes broad money exactly by printing the same number of banknotes as every new bank loan.

Watch for: Do not stop after the first effect of Money demand and interest-rate determination. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Deep banking and capital markets can channel savings into investment and provide jobs, while international volatility can transmit rapidly to Hong Kong. This follows because Hong Kong's financial-centre role is supported by institutions, rule of law, capital flows, expertise, infrastructure and links with other economies, creating services and income but also exposure to financial shocks. Reject the alternative claim that A financial centre affects finance firms only and creates no economy-wide benefits or risks.

Watch for: Do not stop after the first effect of Hong Kong as a financial centre. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Falling real GDP and employment indicate recession, while a trough is the low turning point before recovery. This follows because A business cycle describes short-run fluctuations of real GDP around its long-run trend through recovery, expansion or boom, recession and trough. Reject the alternative claim that A business cycle is a permanent fall in productive capacity and contains no turning points.

Watch for: Do not stop after the first effect of Business cycles. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: A fixed-rate borrower may gain from unexpected inflation as the real value of repayment falls, while the lender loses. This follows because Unexpected inflation redistributes real income and wealth, raises uncertainty and may harm competitiveness, while very low predictable inflation can ease relative-wage adjustment; effects depend on cause and anticipation. Reject the alternative claim that Inflation has identical effects on every household, firm and lender.

Watch for: Do not stop after the first effect of Inflation, deflation, real interest and money. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Demand stimulus may help cyclical unemployment but can cause inflation near capacity and may not retrain structurally unemployed workers. This follows because Unemployment can reduce output, income, skills and tax revenue while raising benefit cost and inequality; suitable policy depends on whether the cause is cyclical, structural or another type. Reject the alternative claim that One expansionary demand policy is equally effective against every type of unemployment.

Watch for: Do not stop after the first effect of Unemployment, underemployment and output gaps. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Technology-led growth may raise returns to scarce skills unless education broadens access. This follows because Growth can reduce poverty and finance services, but its distribution depends on asset ownership, skills, market power and tax-benefit policy; redistribution can also affect opportunity and incentives. Reject the alternative claim that Any redistribution necessarily prevents growth because all tax revenue is destroyed.

Watch for: Do not stop after the first effect of Fiscal policy, taxation and public expenditure. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Rate cuts may have weak effects when pessimistic firms will not borrow, while they may be potent in an interest-sensitive housing boom. This follows because Effectiveness depends on confidence, debt, banking transmission, exchange-rate response, shock type, spare capacity and time lags; rate changes cannot directly repair productive capacity. Reject the alternative claim that Monetary policy has an immediate, certain and equal effect on every component of AD.

Watch for: Do not stop after the first effect of Monetary policy and the AD-AS model. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Higher wages can coexist with improved competitiveness when productivity rises faster and unit labour cost falls. This follows because Competitiveness depends on relative unit costs, productivity, quality, reliability, innovation, infrastructure and the real exchange rate, not nominal wages alone. Reject the alternative claim that A country becomes less competitive whenever nominal wages rise, regardless of productivity or quality.

Watch for: Do not stop after the first effect of Comparative advantage, gains from trade and Hong Kong. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Temporary support may enable learning if performance tests and an exit plan are credible, but entrenched lobbying can make protection permanent. This follows because Infant-industry, anti-dumping, strategic, employment, security and environmental arguments require evidence; costs include higher prices, retaliation, weaker competition and government failure. Reject the alternative claim that Protecting an industry guarantees it becomes internationally competitive because profits rise.

Watch for: Do not stop after the first effect of Trade barriers and the small open economy. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: An export of services enters the current account, while acquisition of a foreign financial asset affects the capital and/or financial side under the required classification depth. This follows because The balance of payments contains a current account, capital account and financial account; candidates classify current transactions and know whether a transaction affects the capital and/or financial account, without having to distinguish those two for a given transaction. Reject the alternative claim that The capital and financial accounts remain one undivided account, and every transaction must be assigned to one of their detailed subcategories.

Watch for: Do not stop after the first effect of Balance of payments. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.

Working and reasoning: Export volume may respond slowly after depreciation because contracts are fixed, while imported-input costs rise sooner. This follows because Depreciation makes domestic output cheaper in foreign currency and imports dearer in domestic currency, but effects on trade balance and inflation depend on elasticities, contracts, capacity and pass-through. Reject the alternative claim that Depreciation must immediately improve the current account because every export price falls.

Watch for: Do not stop after the first effect of Exchange rates and Hong Kong's linked system. Build the chain of reasoning, use the context and explain what could weaken or reverse the outcome.