BU1003 Chapter Notes - Chapter 15: Neutrality Of Money, Business Cycle, Longrun

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15 May 2018
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Chapter 15
SOLUTIONS TO TEXT PROBLEMS:
Quick Quizzes
The answers to the Quick Quizzes can also be found near the end of the textbook.
1. Three key facts about economic fluctuations are: (1) economic fluctuations are
irregular and unpredictable; (2) most macroeconomic quantities fluctuate
together; and (3) as output falls, unemployment rises.
Economic fluctuations are irregular and unpredictable, as you can see by looking
at a graph of real GDP over time. Some recessions are close together and others
are far apart. There appears to be no recurring pattern.
Most macroeconomic quantities fluctuate together. In recessions, real GDP,
consumer spending, investment spending, corporate profits, and other
macroeconomic variables decline or grow much more slowly than during
economic expansions. However, the variables fluctuate by different amounts over
the business cycle, with investment varying much more than other variables.
As output falls, unemployment rises, because when firms want to produce less,
they lay off workers, thus causing a rise in unemployment.
2. The economy’s behavior in the short run differs from its behavior in the long run
because the assumption of monetary neutrality applies only to the long run, not
the short run. In the short run, real and nominal variables are highly intertwined.
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Figure 1 shows the model of aggregate demand and aggregate supply. The
horizontal axis shows the quantity of output, and the vertical axis shows the price
level.
Figure 1
3. The aggregate-demand curve slopes downward for three reasons. First, when
prices fall, the value of dollars in people’s wallets and bank accounts rises, so they
are wealthier. As a result, they spend more, thereby increasing the quantity of
goods and services demanded. Second, when prices fall, people need less money
to make their purchases, so they lend more out, which reduces the interest rate.
The lower interest rate encourages businesses to invest more, increasing the
quantity of goods and services demanded. Third, since lower prices lead to a
lower interest rate, some U.S. investors will invest abroad, supplying dollars to
the foreign-exchange market, thus causing the dollar to depreciate. The decline in
the real exchange rate causes net exports to increase, which increases the quantity
of goods and services demanded.
Any event that alters the level of consumption, investment, government
purchases, or net exports at a given price level will lead to a shift in aggregate
demand. An increase in expenditure will shift the aggregate-demand curve to the
right, while a decline in expenditure will shift the aggregate-demand curve to the
left.
4. The long-run aggregate-supply curve is vertical because the price level does not
affect the long-run determinants of real GDP, which include supplies of labor,
capital, natural resources, and the level of available technology. This is just an
application of the classical dichotomy and monetary neutrality.
There are three reasons the short-run aggregate-supply curve slopes upward. First,
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the sticky-wage theory suggests that because nominal wages are slow to adjust, a
decline in the price level means real wages are higher, so firms hire fewer workers
and produce less, causing the quantity of goods and services supplied to decline.
Second, the sticky-price theory suggests that the prices of some goods and
services are slow to change. If some economic event causes the overall price
level to decline, the relative prices of goods whose prices are sticky will rise and
the quantity of those goods sold will decline, leading firms to cut back on
production. Thus, a lower price level reduces the quantity of goods and services
supplied. Third, the misperceptions theory suggests that changes in the overall
price level can temporarily mislead suppliers. When the price level falls below
the level that was expected, suppliers think that the relative prices of their
products have declined, so they produce less. Thus, a lower price level reduces
the quantity of goods and services supplied.
The long-run and short-run aggregate-supply curves will both shift if the supplies
of labor, capital, or natural resources change or if technology changes. A change
in the expected price level will shift the short-run aggregate-supply curve but will
have no effect on the long-run aggregate-supply curve.
Figure 2
5. When a popular presidential candidate is elected, causing people to be more
confident about the future, they will spend more, causing the aggregate-demand
curve to shift to the right, as shown in Figure 2. The economy begins at point A
with aggregate-demand curve AD1 and short-run aggregate-supply curve AS1.
The equilibrium has price level P1 and output level Y1. Increased confidence
about the future causes the aggregate-demand curve to shift to AD2. The
economy moves to point B, with price level P2 and output level Y2. Over time,
price expectations adjust and the short-run aggregate-supply curve shifts up to AS2
and the economy moves to equilibrium at point C, with price level P3 and output
level Y1.
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