This document discusses the difference between supply-side inflation and demand-side inflation through a story about children buying ice cream. Demand-side inflation occurs when the children are given more allowance money, increasing their purchasing power and demand for ice cream. This causes the ice cream parlor owner to raise prices. Supply-side inflation is illustrated when a new entrant to the market, with knowledge of the increased demand, opens competing ice cream parlors. This increases the supply of ice cream and brings the prices down. The document argues that controlling inflation through increasing supply is more effective and sustainable than using monetary policy to curb demand.