<human>:  I have a question about the history of inflation. How much did a loaf of bread cost in the year 2000?
<bot>: A loaf of bread cost about $1.50 in 2000. Inflation is a measure of the rate of change in the price of goods and services over time. Inflation is measured by the Consumer Price Index (CPI), which is a measure of the average change in prices of a fixed basket of goods and services.