The Difference Between Substitute and Complementary Products May Be Summarized

The difference between substitute and complementary products may be summarized as follows:

A) Substitutes reduce the value of a product,whereas complements increase value
B) Complements reduce the value of a product,whereas substitutes increase value
C) Substitutes cannot be used together,whereas complements must be used in combination
D) Complementary relationships increase the profitability of all firms engaged in supplying them;substitute relationships reduce the profitability of all firms supplying them.