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If commodity X is a by-product of commodity Y, this impli...

If commodity X is a by-product of commodity Y, this implies that both commodities are

A.

In competitive supply

B.

In composite supply

C.

Jointly supplied

D.

In excess supply

Correct answer is B

When the process of making one thing results in a second product as well, that second thing is called a byproduct. Example, the production of computer systems, require a software to function, hence would be jointly supplied.

Composite Supply is one where 2 or more goods or services are supplied together.