This paper addresses several core macroeconomic questions involving business cycle analysis, recession causes, and Keynesian expenditure modeling. It examines the 1999–2000 period as an expansion rather than a boom based on output-gap analysis, and reviews the 1973–1974 transition from boom to recession. It challenges the claim that all recessions stem from oil price increases, citing defense spending cuts and Federal Reserve interest rate policy as alternative causes. Finally, it works through a numerical exercise calculating the marginal propensity to consume, expenditure multiplier, equilibrium GDP, and the effect of reduced government spending on that equilibrium.
During the period 1999–2000, the economy was in an expansion, but not a boom. This period followed the boom of the 1990s, but a flattening of the output line is visible during these years. Output was above potential output, indicating expansion; however, because the slope of the actual output line during these years was lower than the slope of potential output, this period cannot be classified as a boom.
Another period exhibiting this same pattern occurred in 1973–1974, as the economy transitioned from boom to recession. Output growth stalled but remained ahead of potential output for a couple of years before falling behind in the middle part of that decade. In both cases, the key distinguishing factor between expansion and boom is not simply whether output exceeds potential, but whether actual output is growing faster or slower than potential output.
It is incorrect to claim that every recession in the past six decades was caused by an increase in oil prices. While some recessions can be attributed to oil price increases — which resulted in subsequent drops in economic activity — there have been other significant causes as well.
For example, the collapse of the Soviet Union brought about a significant reduction in defense spending, contributing to a mild recession in 1990. In the early 1980s, a change in Federal Reserve policy led to a sharp increase in interest rates, which reduced investment in major consumer products such as homes and automobiles, as well as business investment more broadly, as hurdle rates rose dramatically. These examples demonstrate that recessions are caused by a variety of economic shocks and policy decisions, not solely by oil price movements.
The marginal propensity to consume (MPC) implicit in the data represents an increase of 800 in consumption for every 1,000 increase in income. This gives an MPC of 0.8.
"Deriving multiplier and graphing equilibrium output"
"Effect of lower government spending on equilibrium GDP"
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