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Concept
Substitute good
Summary
In microeconomics, two goods are substitutes if the products could be used for the same purpose by the consumers. That is, a consumer perceives both goods as similar or comparable, so that having more of one good causes the consumer to desire less of the other good. Contrary to complementary goods and independent goods, substitute goods may replace each other in use due to changing economic conditions. An example of substitute goods is Coca-Cola and Pepsi; the interchangeable aspect of these goods is due to the similarity of the purpose they serve, i.e fulfilling customers' desire for a soft drink. These types of substitutes can be referred to as close substitutes.
Substitute goods are commodity which the consumer demanded to be used in place of another good.
Economic theory describes two goods as being close substitutes if three conditions hold:
products have the same or similar performance characteristics
products have the same or similar occasion for use and
products are sold in the same geographic area
Performance characteristics describe what the product does for the customer; a solution to customers' needs or wants. For example, a beverage would quench a customer's thirst.
A product's occasion for use describes when, where and how it is used. For example, orange juice and soft drinks are both beverages but are used by consumers in different occasions (i.e. breakfast vs during the day).
Two products are in different geographic market if they are sold in different locations, it is costly to transport the goods or it is costly for consumers to travel to buy the goods.
Only if the two products satisfy the three conditions, will they be classified as close substitutes according to economic theory. The opposite of a substitute good is a complementary good, these are goods that are dependent on another. An example of complementary goods are cereal and milk.
An example of substitute goods are tea and coffee.
Official source
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