In the Golden Age of Times Past a nickel bought you a candy bar. You had the power to purchase twenty candy bars with one dollar. Now a Big Hunk costs you a big chunk of change, $1. So the purchasing power of a dollar declined from then to now. Purchasing power is a measure of how much one unit of currency buys in a certain place or time compared to what it buys elsewhere. How much candy could you buy with $1 in Quebec?