The document discusses inflation and deflation. It defines inflation as a general rise in prices over time which reduces purchasing power. The document outlines different types of inflation including wage, cost-push, pricing power, and sectoral inflation. It also discusses causes of inflation from both demand and supply sides. Deflation is defined as a general decline in prices over time. The document notes deflation can be caused by a reduction in the money supply, increased demand for money, increased supply of goods, or reduced demand for goods. Measures to control inflation include increasing production and controlling money supply, while deflation generally occurs when the supply of goods rises faster than the supply of money.