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What is cross price elasticity of demand? (XED)
A measure of the responsiveness of demand for one good as the price of another good changes.
How is XED calculated?
% change of quantity demand of good X / % change of price of good Y
What are substitute goods?
Two goods that could be used for the same purpose. If price of one increases, demand for the other will rise.
What are complementary goods?
Goods used together. If demand for one increases demand for the other will too.
How can we find out if goods are substitute or complementary from calculating XED?
Substitute goods = + XED.
Complementary goods = - XED.
Draw a XED graph.
