This document discusses different types of inflation including definitions of inflation, deflation, disinflation, and their causes. It defines inflation as a sustained increase in prices over time. Deflation is a decrease in prices, while disinflation is a slowdown in the rate of inflation. The types of inflation include hyperinflation (over 100% per year), galloping inflation (10-100%), and creeping inflation (<10%). Causes of inflation are discussed as either demand-pull inflation from too much spending, or cost-push inflation from increased costs of production. Inflationary gaps occur when current GDP is higher than potential GDP at full employment, while deflationary gaps are when demand is below full employment supply