- Consider two events: (1) A stock market crash reduces the nominal wealth of many households. (2) A general deflation (a falling price level) occurs across the economy. How do these events distinctively affect the aggregate demand curve?
Answer: Event (1) shifts the AD curve to the left; event (2) causes a downward movement along the AD curve.
This question tests the difference between a shift factor and a movement along the curve. (1) A change in nominal wealth (like a stock market crash) changes consumer spending at any price level, so it is a determinant that shifts the entire AD curve to the left. (2) A change in the price level itself causes a change in the quantity of aggregate demand, which is represented as a movement along the existing AD curve (this is the wealth effect).
- A government enacts a new policy that provides significant tax credits for corporate spending on research and development (R&D). If this policy is successful over several years, what is its most likely primary macroeconomic impact in the aggregate demand/aggregate supply framework?
Answer: A rightward shift of the long-run aggregate supply curve due to technological advancement.
While R&D spending is a form of investment that affects AD in the short run, the primary, long-term goal and effect of such a policy is to spur innovation and technological progress. Technology is a key determinant of an economy's potential output. Therefore, a successful long-term R&D policy will increase the economy's productive capacity, which is represented by a rightward shift of the long-run aggregate supply (LRAS) curve.
- An economy heavily reliant on imported oil experiences a sudden, significant increase in global oil prices. In the short run, what is the most likely impact on its aggregate supply and demand curves?
Answer: The short-run aggregate supply curve will shift to the left, leading to a higher price level and lower output.
Oil is a key input for many industries. A significant increase in its price raises the costs of production across the economy. This is a negative supply shock, which is represented by a leftward shift of the short-run aggregate supply (SRAS) curve. This leads to a higher price level and lower real GDP, a condition known as stagflation. The primary impact is on supply, not demand.
- A government attempts to stimulate a sluggish economy by significantly increasing its spending on public works projects, financed entirely by borrowing. While this action directly shifts aggregate demand to the right, what secondary effect could dampen the overall expansionary impact?
Answer: Increased government borrowing may raise interest rates, which reduces or 'crowds out' private investment spending.
This describes the 'crowding-out effect.' When the government borrows heavily to finance spending, it increases the demand for loanable funds. This can lead to higher interest rates, which makes borrowing more expensive for private firms. As a result, private investment may decrease, partially offsetting the initial increase in aggregate demand from government spending.
- Following the event described in the passage, which sequence correctly describes the short-run impact and the potential long-run adjustment without policy intervention?
Answer: SRAS shifts left, causing stagflation; then, high unemployment may lead to lower nominal wages, shifting SRAS back to the right.
A permanent increase in input prices is a negative supply shock that shifts the SRAS curve to the left. This causes the price level to rise and output to fall (stagflation) in the short run. The resulting recessionary gap (high unemployment) puts downward pressure on nominal wages. In the long run, if wages fall, this reduces production costs and shifts the SRAS curve back towards its original position, restoring long-run equilibrium output.
- An economy is experiencing stagflation, typically caused by a leftward shift of the short-run aggregate supply (SRAS) curve. If policymakers use demand-side fiscal or monetary policy to address the fall in output, what is the unavoidable trade-off they face?
Answer: Stimulating aggregate demand to combat unemployment will likely lead to an even higher price level.
Stagflation is a combination of high inflation and high unemployment (stagnation). The problem is that the two main goals of macroeconomic policy—low inflation and low unemployment—are in direct conflict. Using expansionary policy (shifting AD right) to lower unemployment and increase output will push the price level even higher, worsening inflation. Conversely, using contractionary policy to fight inflation would worsen the recession.
- Assume an economy is in short-run equilibrium with an output level below its long-run potential (a recessionary gap). If the government and central bank take no policy action, what is the most likely long-run automatic adjustment that will return the economy to full employment?
Answer: The persistent high unemployment will eventually lead to falling nominal wages, shifting the SRAS curve to the right.
The classical model's long-run self-correction mechanism for a recessionary gap operates through the labor market. High unemployment puts downward pressure on nominal wages. As wages fall, the cost of production for firms decreases, which shifts the short-run aggregate supply (SRAS) curve to the right. This continues until the economy returns to its long-run potential output, albeit at a lower price level.
- A government simultaneously increases income taxes on households by $100 billion and increases its direct spending on goods and services by $100 billion. According to the standard aggregate demand/aggregate supply model, what is the most likely result of this balanced-budget policy action?
Answer: A small rightward shift in the aggregate demand curve.
This question relates to the concept of the balanced-budget multiplier. The entire $100 billion increase in government spending (G) is a direct injection into aggregate demand. However, the $100 billion tax increase does not reduce consumption (C) by the full amount, because households will pay for part of the tax increase by reducing their savings. Therefore, the direct increase in G is larger than the initial decrease in C, leading to a net increase, or a small rightward shift, in the aggregate demand curve.
- A decrease in the aggregate price level causes households and firms to need less cash for routine transactions. How does this phenomenon contribute to the downward slope of the aggregate demand curve?
Answer: It leads to an increase in loanable funds, lowering real interest rates and stimulating investment spending.
This question describes the interest-rate effect, one of the three reasons for the downward slope of the aggregate demand curve. When the price level falls, people need less money for purchases, so they save more or lend it out. This increases the supply of loanable funds, which lowers the real interest rate and encourages firms to undertake more investment projects, thereby increasing the quantity of real GDP demanded.
- Which of the following events would most likely cause a shift in an economy's long-run aggregate supply (LRAS) curve, rather than only its short-run aggregate supply (SRAS) curve?
Answer: A decade-long government investment program in education that significantly boosts worker productivity.
The long-run aggregate supply (LRAS) curve is determined by an economy's productive capacity, which depends on its stock of labor, capital, natural resources, and technology. A program that boosts worker productivity fundamentally increases this capacity, shifting LRAS to the right. The other options (input price changes, nominal wage hikes, inflationary expectations) affect production costs in the short term and thus only shift the SRAS curve.
- Which of the following events would primarily affect the gross private domestic investment (I) component of aggregate demand rather than the personal consumption expenditures (C) component?
Answer: A change in business expectations regarding future profitability and sales growth.
Gross private domestic investment (I) includes spending by firms on new equipment, structures, and changes in inventories. This spending is heavily influenced by firms' outlook on the future. If businesses are optimistic about future profits, they are more likely to invest in expanding their capacity. The other options all relate more directly to household behavior and thus affect consumption (C).
- The short-run aggregate supply curve is upward-sloping primarily because many input prices, such as nominal wages, are 'sticky'. This stickiness implies that as the overall price level rises, in the short run...
Answer: firms' real revenue per unit sold increases faster than their nominal costs per unit, boosting profit margins.
The sticky wage theory is a core explanation for the upward-sloping SRAS curve. When the aggregate price level rises, firms receive more money for their goods and services. However, if nominal wages are fixed by contract, their main labor costs do not rise proportionally. This increases their per-unit profit, creating a strong incentive to increase production.
- An economy is said to be in long-run equilibrium when...
Answer: the short-run equilibrium output is equal to the economy's potential output.
Long-run equilibrium in the AD-AS model occurs at the intersection of the aggregate demand (AD), short-run aggregate supply (SRAS), and long-run aggregate supply (LRAS) curves. This means the current level of output (the short-run equilibrium) is exactly equal to the economy's full-employment or potential output (represented by the LRAS curve).
- A breakthrough in artificial intelligence technology leads to a widespread, significant, and sustained increase in labor productivity across most industries. What is the predicted effect on the aggregate supply curves?
Answer: Both the short-run and long-run aggregate supply curves will shift to the right.
A sustained increase in productivity is a fundamental improvement in the economy's ability to produce goods and services. This directly increases potential output, shifting the long-run aggregate supply (LRAS) curve to the right. It also lowers production costs at any given price level, which shifts the short-run aggregate supply (SRAS) curve to the right as well.
- The vertical nature of the long-run aggregate supply (LRAS) curve signifies that, in the long run...
Answer: the economy's potential output is determined by its resources and technology, not by the aggregate price level.
The LRAS curve is vertical at the level of potential output (or full-employment output). Its vertical shape indicates that in the long run, when all prices (both input and output) are fully flexible, the quantity of goods and services an economy can produce is determined by real factors like its labor force, capital stock, natural resources, and technological level. Changes in the aggregate price level do not affect these real factors, so potential output remains the same.
- Widespread media reports convince consumers and businesses that a severe recession is imminent. How will the resulting change in expectations likely affect the aggregate demand (AD) and short-run aggregate supply (SRAS) curves in the immediate term?
Answer: AD will shift left as households and firms reduce discretionary spending and investment.
Negative expectations about the future economy cause both consumers and firms to become more cautious. Households increase saving and reduce consumption, while firms postpone investment projects. Both of these actions reduce aggregate spending at any given price level, causing the AD curve to shift to the left. The SRAS curve is not immediately affected by these demand-side expectations.
- All of the following scenarios would be expected to cause a rightward shift in an economy's aggregate demand curve EXCEPT:
Answer: a decrease in the overall price level, making consumers feel wealthier.
A decrease in the overall price level causes a movement along the aggregate demand curve to a point of higher quantity demanded; it does not shift the entire curve. This is known as the wealth effect. The other options are all determinants of AD: an increase in government spending (G), an increase in consumer confidence (which boosts C), and lower interest rates (which boost I and C) all cause the AD curve to shift to the right.
- The national currency of Country A unexpectedly appreciates significantly against the currencies of its major trading partners. Assuming all else remains constant, what is the most likely short-run impact on Country A's aggregate demand (AD)?
Answer: AD will shift to the left because the country's exports become more expensive and its imports become cheaper.
A currency appreciation makes a country's goods more expensive for foreigners to buy, which reduces exports. At the same time, it makes foreign goods cheaper for domestic residents to buy, which increases imports. Since net exports (Exports - Imports) are a component of aggregate demand, a decrease in net exports causes the AD curve to shift to the left.
- If firms and workers across an economy begin to expect a higher rate of inflation in the near future, how will this expectation, by itself, affect the short-run aggregate supply (SRAS) curve?
Answer: It will shift to the left as workers demand higher nominal wages, increasing production costs.
Inflationary expectations are a key determinant of the SRAS curve's position. If workers expect prices to rise, they will negotiate for higher nominal wages to protect their real purchasing power. Firms, anticipating these higher labor costs, will find that production is less profitable at any given price level. This increase in the cost of production shifts the SRAS curve to the left.
- An economy's central bank implements a contractionary monetary policy, leading to a significant increase in real interest rates. The resulting decrease in investment and consumption causes the aggregate demand curve to shift left. How is this change reflected on the short-run aggregate supply (SRAS) curve?
Answer: As a movement downward and to the left along the existing SRAS curve.
A shift in the aggregate demand curve leads to a new short-run equilibrium point. This new equilibrium is found at the intersection of the new AD curve and the existing SRAS curve. As the AD curve shifts left, the economy moves to a point with a lower price level and lower output, which represents a downward movement along the stable SRAS curve.
