An increase in the overall level of prices is called inflation. Negative inflation, or a decrease in the overall level of prices, is called deflation. The percentage change in the price level from year one to year two is calculated as follows:
Inflation Rate | = | 100×($14.00−$15.00)$15.00 |
| = | 100×(−$1.00)$15.00 |
| = | −6.67% |
In year one, $120.00 can purchase $120.00$15.00 per basket=8 baskets. In year two, $120.00 can purchase $120.00$14.00 per basket=8.57 baskets. Notice that $120.00 purchases fewer baskets in year one. As the price level falls from year one to year two, the value of money rises.