Explanation​:

Leakages involve income earned that is not spent on domestic goods and services. Leakages include: saving, taxes, and import spending.

Export revenue is an injection into the circular flow, not a leakage.

Therefore, choices A, C, and D are incorrect because export revenue is an injection, not a leakage.

Explanation​:
Choice D is the correct answer because it shows that the equilibrium price level would increase without any increase in the equilibrium GDP level. This occurs when the economy has reached the full employment real GDP and there are no unused factors of production. Increasing AD causes inflation without any growth to real GDP.

Choice A is incorrect because it shows a scenario of growth without any inflation.
Both choices B and C depict a scenario of growth with inflation where both the equilibrium APL and real GDP increase.

Explanation​:
The aggregate demand shifts rightward (AD1​ to AD2​) when a component of AD increases. The components of AD are consumption (C), investment (I), government spending (G), and net exports (NX), which are calculated as exports (X) minus (M).

Choice I is incorrect because a future decrease in price levels will incentivise people to reduce consumption.

Choice II is correct because a reduction in interest rates boosts consumption and investment.

Choice III is incorrect because an increase in income taxes reduces disposable income and leads to a fall in consumption.

Choice IV is correct because an increase in income of trading partners increases a country's exports, increasing net exports.

Explanation​:
There is often a conflict between achieving economic growth and equity in the distribution of income.

The pursuit of better economic well-being for citizens and increased efficiency of the economic system does not always guarantee an equitable distribution of the benefits.

Choices A and C are also possible conflicts with the goal of high economic growth, while choice B often accompanies high economic growth.

Explanation​:
Seasonal unemployment is a type or cause of unemployment, not one of the difficulties of measuring unemployment.

Choices A, C, and B are all factors making the measurement of unemployment unreliable.

Explanation​:
Budget deficits are financed through borrowing, which will $\text{‘}$crowd out$\text{’}$ private investment. Increased government borrowing makes loanable funds scarcer, driving up their price (interest rates).

Choices A, B and C are wrong, as sustained budget deficits increase AD and therefore the level of economic activity, resulting in:

• decreased net exports (X-M), which move the country towards a current account deficit
• increased inflation
• decreased unemployment

Explanation​:

The AS curve shifts when there are changes in the costs of factors of production or indirect taxes (VAT). The AD curve shifts when there is a change in domestic consumption, investment, government spending, or net exports.

A cut in income tax would increase AD (AD1​ to AD2​), increasing disposable income and domestic consumption. A rise in indirect taxes would decrease AS (AS1​ to AS3​), as it would increase production costs across the economy.

Explanation​:
A fall in interest rates will make borrowing cheaper, and so encourage investment expenditure: aggregate demand (AD) will increase in the short-run.

Moreover, investment is the spending on the creation or replacement of capital, so in the long run, the quantity of capital will increase, leading to an increase in long-run aggregate supply (LRAS).

Choices A, C, and D will lead to an increase in AD in the short run, but are unlikely to cause an increase in LRAS in the long run.

Explanation​:
In the Keynesian model, wages are assumed to be downwardly inflexible: they may rise in times of inflation, but rarely fall in times of recession. For this reason, the economy could get stuck in a recessionary gap if the government does not intervene. This is because production costs will not fall, and so, aggregate supply will not increase.

Choices A, B, and C are all associated with the new classical/monetarist model, which assumes that recessionary gaps are not persistent.

Explanation
The HDI is a composite indicator measuring economic development across three dimensions:

• Standard of living, measured by GNI per capita (PPP) (Choice B)
• Education, measured by mean years of schooling (Choice C) and expected years of schooling
• Health, measured by life expectancy at birth (Choice D)

Explanation​:
An increase in the corporate tax rate will decrease AD by decreasing investment in the economy.

Choices B and D redistribute income in a way that should increase consumption, as the marginal propensity to consume for lower-income households tends to be higher.

Choice C is wrong, as increasing government spending directly increases AD.

Explanation​:
A decrease in sales taxes will lower production costs for businesses across the economy, which increases short-run aggregate supply, reducing inflationary pressure.

Choice A will cause demand-pull inflation. Choices B and C will cause cost-push inflation. Therefore, choices A, B, and C are causes of inflation.

Explanation​:
Choice D incorrectly describes speculative demand for money. It suggests that money has inherent value and that people speculate on the appreciation of money itself. However, speculative demand for money occurs when people anticipate a change in interest rates and prefer to hold money over interest-bearing assets.
Choice A describes the transactions motive.
Choice B describes the precautionary motive.
Choice C describes the speculative motive.

Explanation​:
Statement I is correct: an outward shift of the PPC illustrates long-term growth or growth in production possibilities.

Statement II is correct: a movement closer to an existing PPC shows short-term growth, or growth in actual output.

Statement III is correct: an outward shift of the PPC occurs if the quantity of resources increases.

Statement IV is incorrect: an increase in the quality of resources shifts the PPC outward.

Explanation​:
There is often a conflict between achieving economic growth and environmental sustainability. The pursuit of better economic well-being for citizens and increased efficiency of the economic system does not always guarantee environmental sustainability.

Economic growth is often accompanied by job creation and improvements in the standard of living of many citizens, so choices A and B are likely to be true. Economic growth often means an increase in total output produced by the economy, which involves the use of more resources and the production of more waste, so choice C is likely to be true.

It is least likely that economic growth is accompanied by decreases in greenhouse gas emissions, and thus choice D is the least likely to be true.

Explanation​:
To determine GDP, the expenditure approach sums the expenditure of all sectors of the economy: spending on capital by firms, plus spending on domestic goods and services by households, the government, and foreign consumers, minus domestic spending on foreign goods and services.

$GDP=C+I+G+(X-M)$

Choices A and D are incorrect because saving and taxes are never included in GDP. Choice B is incorrect because the equation calculates net exports incorrectly.

Explanation​:
Statement I is a limitation because interventionist supply-side policies involve a long time lag between implementation and seeing the desired effects.

Statement II is not a valid point when discussing the effectiveness of interventionist supply-side policies (these polices are very costly and do burden the government budget).

Statement III is an advantage of interventionist supply-side policies because the government can target the sectors it deems most important for growth.

Explanation​:
Statements I and III are characteristics of interventionist supply-side policies. Providing education or improving quality and access to health care improves human capital, increasing aggregate supply.

Statement II is an example of a market-based supply-side policy aimed at encouraging competition, rather than a characteristic of interventionist supply-side policies

Statement IV is also characteristic of interventionist supply-side policy, because providing infrastructure makes the economy more efficient and productive.

Explanation​:
Interventionist supply-side policies may be a burden on the government budget but they often lead to a more equitable distribution of income, and less economic inequality.

Choices A, C, and D are possible drawbacks of such policies: they are expensive and may place an unsustainable burden on national debt, they involve long time-lags, and the increased government spending may create inflationary pressures in the economy.

Explanation​:
Changes in taxation and government spending can be directed towards different socioeconomic groups or different branches of industry.

Choice B is wrong because there are many trade-offs in achieving macroeconomic goals. For example, increased economic growth and employment can cause high inflation and/or a current account deficit.

Choice C is wrong as it can take time:

• for governments to recognise that action is required in the first place
• for political bodies to agree on what to do
• for the policy to impact the economy

Choice D is wrong because expansionary fiscal policy will have a greater impact on real output if there is plenty of excess capacity in the economy.

Explanation​:
When the short-run RGDP equilibrium level exceeds the full employment level of GDP, the economy is experiencing an inflationary gap. Contractionary monetary policy is required to decrease aggregate demand, which involves shifting the AD curve to the left. This shift reduces both the aggregate price level and the short-run RGDP equilibrium level, ultimately helping to close the inflationary gap.

I and IV are examples of contractionary monetary policy.

II and III are examples of expansionary monetary policy.

Explanation​:
LRAS shifts rightward when there is an increase in the quantity or quality of factors of production (FOPs), improvements in technology, increases in efficiency, or improvements in institutions.

Choices I and II: both will shift LRAS to the right. An increase in immigration increases the quantity of labour, and improvements in technology will increase efficiency in production, improving the quality of FOPs.

Choices III and IV are determinants of SRAS that would lower production costs and thus shift the SRAS curve rightward. Indirect taxes and production costs do not affect the quality or quantity of FOPs, so LRAS is unaffected.

Explanation​:
Choice A is the correct answer by definition. Quantitative easing is a process where a central bank buys long-term government bonds (and other financial assets) from commercial banks (other financial institutions) and credits their accounts with electronic reserves as digital entries held by the commercial banks at the central bank.