 Learning Objectives

Learning Objectives

By the end of this section, you will be able to do the following:
• Explain the aggregate supply curve and how it relates to real GDP and potential GDP
• Explain the aggregate demand curve and how it is influenced by price levels
• Interpret the aggregate demand/aggregate supply model
• Identify the point of equilibrium in the aggregate demand/aggregate supply model
• Define short run aggregate supply and long run aggregate supply

To build a useful macroeconomic model, we need a model that shows what determines total supply or total demand for the economy, and how total demand and total supply interact at the macroeconomic level. This model is called the supply/aggregate demand (AS/AD) model. This module will explain aggregate supply, aggregate demand, and the equilibrium between them. The following modules will discuss the causes of shifts in aggregate supply and aggregate demand.

The Aggregate Supply Curve and Potential GDP

The Aggregate Supply Curve and Potential GDP

Firms make decisions about what quantity to supply based on the profits they expect to earn. In turn, profits are also determined by the price of the outputs the firm sells and by the price of the inputs, like labor or raw materials, the firm needs to buy. Aggregate supply (AS) refers to the total quantity of output (i.e., real GDP) firms will produce and sell. The aggregate supply (AS) curve shows the total quantity of output (i.e., real GDP) that firms will produce and sell at each price level.

Figure 10.3 shows an AS curve. In the following paragraphs, we will walk through the elements of the diagram one at a time: the horizontal and vertical axes, the AS curve itself, and the meaning of the potential GDP vertical line.

Figure 10.3 The Aggregate Supply Curve AS slopes up, because as the price level for outputs rises, with the price of inputs remaining fixed, firms have an incentive to produce more and to earn higher profits. The potential GDP line shows the maximum that the economy can produce with full employment of workers and physical capital.

The horizontal axis of the diagram shows real GDP—that is, the level of GDP adjusted for inflation. The vertical axis shows the price level. Remember that the price level is different from the inflation rate. Visualize the price level as an index number, like the GDP deflator, while the inflation rate is the percentage change between price levels over time.

As the price level—the average price of all goods and services produced in the economy—rises, the aggregate quantity of goods and services supplied rises as well. Why? The price level shown on the vertical axis represents prices for final goods or outputs bought in the economy—like the GDP deflator—not the price level for intermediate goods and services that are inputs to production. Thus, the AS curve describes how suppliers will react to a higher price level for final outputs of goods and services, while holding the prices of inputs like labor and energy constant. If firms across the economy face a situation where the price level of what they produce and sell is rising, but their costs of production are not rising, then the lure of higher profits will induce them to expand production.

The slope of an AS curve changes from nearly flat at its far left to nearly vertical at its far right. At the far left of the AS curve, the level of output in the economy is far below potential GDP, which is defined as the quantity that an economy can produce by fully employing its existing levels of labor, physical capital, and technology, in the context of its existing market and legal institutions. At these relatively low levels of output, levels of unemployment are high, and many factories are running only part-time, or have closed their doors. In this situation, a relatively small increase in the prices of the outputs that businesses sell—while making the assumption of no rise in input prices—can encourage a considerable surge in the quantity of AS because so many workers and factories are ready to swing into production.

As the quantity produced increases, however, certain firms and industries will start running into limits: perhaps nearly all of the expert workers in a certain industry will have jobs or factories in certain geographic areas or industries will be running at full speed. In the intermediate area of the AS curve, a higher price level for outputs continues to encourage a greater quantity of output—but as the increasingly steep upward slope of the AS curve shows, the increase in quantity in response to a given rise in the price level will not be quite as large. Read the following Clear It Up feature to learn why the AS curve crosses potential GDP.

Clear It Up

Why does aggregate supply cross potential GDP?

The AS curve is typically drawn to cross the potential GDP line. This shape may seem puzzling: How can an economy produce at an output level which is higher than its potential or full employment GDP? The economic intuition here is that if prices for outputs were high enough, producers would make fanatical efforts to produce: All workers would be on double-overtime, all machines would run 24 hours a day, seven days a week. Such hyper-intense production would go beyond using potential labor and physical capital resources fully, to using them in a way that is not sustainable in the long term. Thus, it is indeed possible for production to sprint above potential GDP, but only in the short run.

At the far right, the AS curve becomes nearly vertical. At this quantity, higher prices for outputs cannot encourage additional output, because even if firms want to expand output, the inputs of labor and machinery in the economy are fully employed. In this example, the vertical line in the exhibit shows that potential GDP occurs at a total output of 9,500. When an economy is operating at its potential GDP, machines and factories are running at capacity, and the unemployment rate is relatively low—at the natural rate of unemployment. For this reason, potential GDP is sometimes also called full-employment GDP.

The Aggregate Demand Curve

The Aggregate Demand Curve

AD refers to the amount of total spending on domestic goods and services in an economy. Strictly speaking, AD is what economists call total planned expenditure. This distinction will be further explained in the appendix The Expenditure-Output Model. For now, just think of AD as total spending. It includes all four components of demand: consumption, investment, government spending, and net exports—exports minus imports. This demand is determined by a number of factors, but one of them is the price level—recall though, that the price level is an index number such as the GDP deflator that measures the average price of the things we buy. The AD curve shows the total spending on domestic goods and services at each price level.

Figure 10.4 presents an AD curve. Just like the AS curve, the horizontal axis shows real GDP and the vertical axis shows the price level. The AD curve slopes down, which means that increases in the price level of outputs led to a lower quantity of total spending. The reasons behind this shape are related to how changes in the price level affect the different components of AD. The following components make up the AD—consumption spending (C), investment spending (I), government spending (G), and spending on exports (X) minus imports (M).

AD = C + I + G + X – M

Figure 10.4 The Aggregate Demand Curve AD slopes down, showing that, as the price level rises, the amount of total spending on domestic goods and services declines.

The wealth effect holds that as the price level increases, the buying power of savings that people have stored up in bank accounts and other assets will diminish, eaten away to some extent by inflation. Because a rise in the price level reduces people’s wealth, consumption spending will fall as the price level rises.

The interest rate effect is that as prices for outputs rise, the same purchases will take more money or credit to accomplish. This additional demand for money and credit will push interest rates higher. In turn, higher interest rates will reduce borrowing by businesses for investment purposes and reduce borrowing by households for homes and cars—thus reducing consumption and investment spending.

The foreign price effect points out that if prices rise in the United States while remaining fixed in other countries, then goods in the United States will be relatively more expensive compared to goods in the rest of the world. U.S. exports will be relatively more expensive, and the quantity of exports sold will fall. U.S. imports from abroad will be relatively cheaper, so the quantity of imports will rise. Thus, a higher domestic price level, relative to price levels in other countries, will reduce net export expenditures.

Truth be told, among economists all three of these effects are controversial, in part because they do not seem to be very large. For this reason, the AD curve in Figure 10.4 slopes downward fairly steeply; the steep slope indicates that a higher price level for final outputs reduces AD for all three of these reasons, but that the change in the quantity of AD as a result of changes in price level is not very large.

Read the following Work It Out feature to learn how to interpret the AD/AS model. In this example, aggregate supply, AD, and the price level are given for the imaginary country of Xurbia.

Work It Out

Interpreting the Aggregate Demand/Aggregate Supply Model

Table 10.1 shows information on aggregate supply, aggregate demand, and the price level for the imaginary country of Xurbia. What information does Table 10.1 tell you about the state of the Xurbia’s economy? Where is the equilibrium price level and output level—this is the short run (SR) macroequilibrium? Is Xurbia risking inflationary pressures or facing high unemployment? How can you tell?

Price Level Aggregate Demand Aggregate Supply
110 $700$600
120 $690$640
130 $680$680
140 $670$720
150 $660$740
160 $650$760
170 $640$770
Table 10.1 Price Level: Aggregate Demand/Aggregate Supply

To begin to use the AD/AS model, it is important to plot the AS and AD curves from the data provided. What is the equilibrium?

Step 1. Draw your x- and y-axis. Label the x-axis Real GDP and the y-axis Price Level.

Step 3. Plot AS on your graph.

Step 4. Look at Figure 10.5 which provides a visual to aid in your analysis.

Figure 10.5 The AD/AS Curves AD and AS curves created from the data in Table 10.1.

Step 5. Determine where AD and AS intersect. This is the equilibrium with price level at 130 and real GDP at $680. Step 6. Look at the graph to determine where equilibrium is located. We can see that this equilibrium is fairly far from where the AS curve becomes near-vertical—or at least quite steep—which seems to start at about$750 of real output. This implies that the economy is not close to potential GDP. Thus, unemployment will be high. In the relatively flat part of the AS curve, where the equilibrium occurs, changes in the price level will not be a major concern, since such changes are likely to be small.

Step 7. Determine what the steep portion of the AS curve indicates. Where the AS curve is steep, the economy is at or close to potential GDP.

Step 8. Draw conclusions from the given information:

• If equilibrium occurs in the flat range of AS, then economy is not close to potential GDP and will be experiencing unemployment, but stable price level.
• If equilibrium occurs in the steep range of AS, then the economy is close or at potential GDP and will be experiencing rising price levels or inflationary pressures, but will have a low unemployment rate.

Equilibrium in the Aggregate Demand/Aggregate Supply Model

Equilibrium in the Aggregate Demand/Aggregate Supply Model

The intersection of the AS and AD curves shows the equilibrium level of real GDP and the equilibrium price level in the economy. At a relatively low price level for output, firms have little incentive to produce, although consumers would be willing to purchase a high quantity. As the price level for outputs rises, AS rises and AD falls until the equilibrium point is reached.

Figure 10.6 combines the AS curve from Figure 10.3 and the AD curve from Figure 10.4 and places them both on a single diagram. In this example, the equilibrium point occurs at point E, at a price level of 90 and an output level of $8,800. Figure 10.6 Aggregate Supply and Aggregate Demand The equilibrium, where AS equals AD, occurs at a price level of 90 and an output level of$8,800.

Confusion sometimes arises between the AS and AD model and the microeconomic analysis of demand and supply in particular markets for goods, services, labor, and capital. Read the following Clear It Up feature to gain an understanding of whether AS and AD are macro or micro.

Clear It Up

Are aggregate supply and aggregate demand macro or micro?

These AS and AD model and the microeconomic analysis of demand and supply in particular markets for goods, services, labor, and capital have a superficial resemblance, but they also have many underlying differences.

For example, the vertical and horizontal axes have distinctly different meanings in macroeconomic and microeconomic diagrams. The vertical axis of a microeconomic demand and supply diagram expresses a price—or wage or rate of return—for an individual good or service. This price is implicitly relative as it is intended to be compared with the prices of other products, for example, the price of pizza relative to the price of fried chicken. In contrast, the vertical axis of an AS and AD diagram expresses the level of a price index like the Consumer Price Index or the GDP deflator—combining a wide array of prices from across the economy. The price level is absolute: It is not intended to be compared to any other prices since it is essentially the average price of all products in an economy. The horizontal axis of a microeconomic supply and demand curve measures the quantity of a particular good or service. In contrast, the horizontal axis of the AD and AS diagram measures GDP, which is the sum of all the final goods and services produced in the economy, not the quantity in a specific market.

In addition, the economic reasons for the shapes of the curves in the macroeconomic model are different from the reasons behind the shapes of the curves in microeconomic models. Demand curves for individual goods or services slope down primarily because of the existence of substitute goods, not the wealth effects, interest rate, and foreign price effects associated with AD curves. The slopes of individual supply and demand curves can have a variety of different slopes, depending on the extent to which quantity demanded and quantity supplied react to price in that specific market, but the slopes of the AS and AD curves are much the same in every diagram, although as we shall see in later chapters, short-run and long-run perspectives will emphasize different parts of the AS curve.

In short, just because the AD/AS diagram has two lines that cross, do not assume that it is the same as every other diagram where two lines cross. The intuitions and meanings of the macro and micro diagrams are only distant cousins from different branches of the economics family tree.

Defining Short Run Aggregate Supply and Long Run Aggregate Supply

Defining Short Run Aggregate Supply and Long Run Aggregate Supply

In the Clear It Up feature titled “Why does AS cross potential GDP?” we differentiated between short run changes in AS which are shown by the AS curve and long run changes in AS which are defined by the vertical line at potential GDP. In the short run, if demand is too low or too high, it is possible for producers to supply less GDP or more GDP than potential. In the long run, however, producers are limited to producing at potential GDP. For this reason, what we have been calling the AS curve, will from this point on may also be referred to as the short run aggregate supply (SRAS) curve. The vertical line at potential GDP may also be referred to as the long run aggregate supply (LRAS) curve.