Consumption, Investment, Government Purchases

The idea is to stimulate one of the components of aggregate spending—consumption, investment, government purchases, or net exports. One fiscal policy measure is an increase in government purchases. Suppose the government increases its expenditure—perhaps by hiring more teachers, buying more tanks, or building more roads. This increases autonomous spending and works its way through the economy, just as in our earlier discussion of a decrease in autonomous consumption—except now we are talking about an increase rather than a decrease. If the government spends an extra dollar, this immediately expands income by that dollar. Extra income leads to extra spending, which leads to further increases in output and income. The process continues around and around the circular flow. Imagine that, as before, the marginal propensity to spend is 0.8, so that the multiplier is 5. If the government increases expenditure on goods and services by $1 billion, overall GDP in the economy will increase by $5 billion. Thus to offset the decrease in real GDP of about $90 billion between 1929 and 1933, assuming a marginal propensity to spend of 0.8, the federal government should have increased government spending by $18 billion. The multiplier is a double-edged sword. It has the bad effect that it can turn small decreases in spending into big decreases in output. But it also means that relatively small changes in government spending can have a big effect on output. Tax cuts are another way to stimulate the economy. If households have to pay fewer taxes to the government, they are likely to spend more on consumption goods. This form of policy intervention has been used over and over again by governments in the United States and elsewhere. Tax cuts, like government spending, must be paid for. If the government spends more and taxes less, then the government deficit increases. The government must borrow to finance such fiscal policy measures. [1] The central bank can use monetary policy to affect aggregate spending. Monetary policy operates through changes in interest rates, which are—in the short run at least—under the influence of the central bank. Lower interest rates make it cheaper for firms to borrow, which encourages them to increase investment spending. Lower interest rates likewise mean lower mortgage rates, so households are more likely to buy new homes. Lower interest rates may encourage households to borrow and spend more on other goods. And lower interest rates can even encourage net exports. [2] Monetary and Fiscal Policies during the Great Depression We have argued that monetary and fiscal policies could have been used to help the economy out of the Great Depression. But what did policymakers actually do at the time? The answer comes in two parts: at the start of the Great Depression, they did not do much; after 1932, they did rather more.