Council for Economic Education
What's the Big Deal about Spices?
Today's gourmands don't consider spices to be the equivalent of silver and gold. During the middle ages, however, these commodities were precious. People back then used spices in religious ceremonies, to cure rotten food, and as a show...
Robert Schenk, PhD
St. Josephs College: More Price Elasticity
This site explains price elasticity of supply. Includes graphs to represent the concept.