Giáo trình


Science and Technology

The Building Blocks of Keynesian Analysis

Tác giả: OpenStaxCollege

Now that we have a clear understanding of what constitutes aggregate demand, we return to the Keynesian argument using the model of aggregate demand/aggregate supply (AD/AS). (For a similar treatment using Keynes’ income-expenditure model, see the appendix on The Expenditure-Output Model.)

Keynesian economics focuses on explaining why recessions and depressions occur and offering a policy prescription for minimizing their effects. The Keynesian view of recession is based on two key building blocks. First, aggregate demand is not always automatically high enough to provide firms with an incentive to hire enough workers to reach full employment. Second, the macroeconomy may adjust only slowly to shifts in aggregate demand because of sticky wages and prices, which are wages and prices that do not respond to decreases or increases in demand. We will consider these two claims in turn, and then see how they are represented in the AD/AS model.

The first building block of the Keynesian diagnosis is that recessions occur when the level of household and business sector demand for goods and services is less than what is produced when labor is fully employed. In other words, the intersection of aggregate supply and aggregate demand occurs at a level of output less than the level of GDP consistent with full employment. Suppose the stock market crashes, as occurred in 1929. Or, suppose the housing market collapses, as occurred in 2008. In either case, household wealth will decline, and consumption expenditure will follow. Suppose businesses see that consumer spending is falling. That will reduce expectations of the profitability of investment, so businesses will decrease investment expenditure.

This seemed to be the case during the Great Depression, since the physical capacity of the economy to supply goods did not alter much. No flood or earthquake or other natural disaster ruined factories in 1929 or 1930. No outbreak of disease decimated the ranks of workers. No key input price, like the price of oil, soared on world markets. The U.S. economy in 1933 had just about the same factories, workers, and state of technology as it had had four years earlier in 1929—and yet the economy had shrunk dramatically. This also seems to be what happened in 2008.

As Keynes recognized, the events of the Depression contradicted Say’s law that “supply creates its own demand.” Although production capacity existed, the markets were not able to sell their products. As a result, real GDP was less than potential GDP.

Wage and Price Stickiness

Keynes also pointed out that although AD fluctuated, prices and wages did not immediately respond as economists often expected. Instead, prices and wages are “sticky,” making it difficult to restore the economy to full employment and potential GDP. Keynes emphasized one particular reason why wages were sticky: the coordination argument. This argument points out that, even if most people would be willing—at least hypothetically—to see a decline in their own wages in bad economic times as long as everyone else also experienced such a decline, a market-oriented economy has no obvious way to implement a plan of coordinated wage reductions. Unemployment proposed a number of reasons why wages might be sticky downward, most of which center on the argument that businesses avoid wage cuts because they may in one way or another depress morale and hurt the productivity of the existing workers.

Some modern economists have argued in a Keynesian spirit that, along with wages, other prices may be sticky, too. Many firms do not change their prices every day or even every month. When a firm considers changing prices, it must consider two sets of costs. First, changing prices uses company resources: managers must analyze the competition and market demand and decide what the new prices will be, sales materials must be updated, billing records will change, and product labels and price labels must be redone. Second, frequent price changes may leave customers confused or angry—especially if they find out that a product now costs more than expected. These costs of changing prices are called menu costs—like the costs of printing up a new set of menus with different prices in a restaurant. Prices do respond to forces of supply and demand, but from a macroeconomic perspective, the process of changing all prices throughout the economy takes time.

To understand the effect of sticky wages and prices in the economy, consider [link] (a) illustrating the overall labor market, while [link] (b) illustrates a market for a specific good or service. The original equilibrium (E0) in each market occurs at the intersection of the demand curve (D0) and supply curve (S0). When aggregate demand declines, the demand for labor shifts to the left (to D1) in [link] (a) and the demand for goods shifts to the left (to D1) in [link] (b). However, because of sticky wages and prices, the wage remains at its original level (W0) for a period of time and the price remains at its original level (P0).

As a result, a situation of excess supply—where the quantity supplied exceeds the quantity demanded at the existing wage or price—exists in markets for both labor and goods, and Q1 is less than Q0 in both [link] (a) and [link] (b). When many labor markets and many goods markets all across the economy find themselves in this position, the economy is in a recession; that is, firms cannot sell what they wish to produce at the existing market price and do not wish to hire all who are willing to work at the existing market wage. The Clear It Up feature discusses this problem in more detail.

Sticky Prices and Falling Demand in the Labor and Goods Market
In both (a) and (b), demand shifts left from D0 to D1. However, the wage in (a) and the price in (b) do not immediately decline. In (a), the quantity demanded of labor at the original wage (W0) is Q0, but with the new demand curve for labor (D1), it will be Q1. Similarly, in (b), the quantity demanded of goods at the original price (P0) is Q0, but at the new demand curve (D1) it will be Q1. An excess supply of labor will exist, which is called unemployment. An excess supply of goods will also exist, where the quantity demanded is substantially less than the quantity supplied. Thus, sticky wages and sticky prices, combined with a drop in demand, bring about unemployment and recession.

The Two Keynesian Assumptions in the AD/AS Model

These two Keynesian assumptions—the importance of aggregate demand in causing recession and the stickiness of wages and prices—are illustrated by the AD/AS diagram in [link]. Note that because of the stickiness of wages and prices, the aggregate supply curve is flatter than either supply curve (labor or specific good). In fact, if wages and prices were so sticky that they did not fall at all, the aggregate supply curve would be completely flat below potential GDP, as shown in [link]. This outcome is an important example of a macroeconomic externality, where what happens at the macro level is different from and inferior to what happens at the micro level. For example, a firm should respond to a decrease in demand for its product by cutting its price to increase sales. But if all firms experience a decrease in demand for their products, sticky prices in the aggregate prevent aggregate demand from rebounding (which would be shown as a movement along the AD curve in response to a lower price level).

The original equilibrium of this economy occurs where the aggregate demand function (AD0) intersects with AS. Since this intersection occurs at potential GDP (Yp), the economy is operating at full employment. When aggregate demand shifts to the left, all the adjustment occurs through decreased real GDP. There is no decrease in the price level. Since the equilibrium occurs at Y1, the economy experiences substantial unemployment.

A Keynesian Perspective of Recession
The equilibrium (E0) illustrates the two key assumptions behind Keynesian economics. The importance of aggregate demand is shown because this equilibrium is a recession which has occurred because aggregate demand is at AD1 instead of AD0. The importance of sticky wages and prices is shown because of the assumption of fixed wages and prices, which make the SRAS curve flat below potential GDP. Thus, when AD falls, the intersection E1 occurs in the flat portion of the SRAS curve where the price level does not change.

The Expenditure Multiplier

A key concept in Keynesian economics is the expenditure multiplier. The expenditure multiplier is the idea that not only does spending affect the equilibrium level of GDP, but that spending is powerful. More precisely, it means that a change in spending causes a more than proportionate change in GDP.

ΔY ΔSpending >1

The reason for the expenditure multiplier is that one person’s spending becomes another person’s income, which leads to additional spending and additional income, and so forth, so that the cumulative impact on GDP is larger than the initial increase in spending. The details of the multiplier process are provided in the appendix on The Expenditure-Output Model, but the concept is important enough to be summarized here. While the multiplier is important for understanding the effectiveness of fiscal policy, it occurs whenever any autonomous increase in spending occurs. Additionally, the multiplier operates in a negative as well as a positive direction. Thus, when investment spending collapsed during the Great Depression, it caused a much larger decrease in real GDP. The size of the multiplier is critical and was a key element in recent discussions of the effectiveness of the Obama administration’s fiscal stimulus package, officially titled the American Recovery and Reinvestment Act of 2009.

Key Concepts and Summary

Keynesian economics is based on two main ideas: (1) aggregate demand is more likely than aggregate supply to be the primary cause of a short-run economic event like a recession; (2) wages and prices can be sticky, and so, in an economic downturn, unemployment can result. The latter is an example of a macroeconomic externality. While surpluses cause prices to fall at the micro level, they do not necessarily at the macro level; instead the adjustment to a decrease in demand occurs only through decreased quantities. One reason why prices may be sticky is menu costs, the costs of changing prices. These include internal costs a business faces in changing prices in terms of labeling, recordkeeping, and accounting, and also the costs of communicating the price change to (possibly unhappy) customers. Keynesians also believe in the existence of the expenditure multiplier—the notion that a change in autonomous expenditure causes a more than proportionate change in GDP.

Self-Check Questions

Use the AD/AS model to explain how an inflationary gap occurs, beginning from the initial equilibrium in [link].

An inflationary gap is the result of an increase in aggregate demand when the economy is at potential output. Since the AS curve is vertical at potential GDP, any increase in AD will lead to a higher price level (i.e. inflation) but no higher real GDP. This is easy to see if you draw AD1 to the right of AD0.

Suppose the U.S. Congress cuts federal government spending in order to balance the Federal budget. Use the AD/AS model to analyze the likely impact on output and employment. Hint: revisit [link].

A decrease in government spending will shift AD to the left.

Review Questions

From a Keynesian point of view, which is more likely to cause a recession: aggregate demand or aggregate supply, and why?

Why do sticky wages and prices increase the impact of an economic downturn on unemployment and recession?

Explain what economists mean by “menu costs.”

Critical Thinking Questions

Does it make sense that wages would be sticky downwards but not upwards? Why or why not?

Suppose the economy is operating at potential GDP when it experiences an increase in export demand. How might the economy increase production of exports to meet this demand, given that the economy is already at full employment?


Harford, Tim. “What Price Supply and Demand?”

National Employment Law Project. “Job Creation and Economic Recovery.”

Mục lục
Đánh giá:
0 dựa trên 0 đánh giá
Nội dung cùng tác giả
Nội dung tương tự