A market might have an upward-sloping long-run supply curve if:

a. firms have different costs.

Explanation:

A market might have an upward-sloping long-run supply curve if

a. firms have different costs.

b. consumers exercise market power over producers.

c. all factors of production are essentially available in unlimited supply.

d. the entry of new firms into the market has no effect on the cost structure of firms in the market.

a corporation is legally separate from its owner, and it pays its own taxes.

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