Elasticity of Demand

Complementary goods refer to two or more items that are usually consumed simultaneously. Examples are cars and gasoline. We need gasoline as fuel to drive the vehicle.Complementary products may be part of other items such as a motorcycle and tire

Substitute goods refer to two or more goods that meet similar needs, so they become alternatives to each other. For example, Coca-Cola is a close substitute for Pepsi. Because it is an alternative, consumers switch to their substitutes when