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An increase in the supply of a commodity X automatically ...

An increase in the supply of a commodity X automatically results in an increase in the supply of another commodity Y. This is a cause of

A.

Elastic supply

B.

Joint supply

C.

Exceptional supply

D.

Competitive supply

Correct answer is B

Joint supply is where an increase or decrease in the supply of one good leads to an increase or decrease in supply of a by-product. For instance, an increase in the production of computers would lead to a corresponding increase in the supply of computer software, because a computer requires a software to operate.