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The short-run industry supply curve for a perfectly competitive industry is the ?

a) horizontal sum of the individual firms'marginal cost curves above AVC.
b) vertical sum of the individual firms'marginal cost curves above AVC.
c) horizontal sum of the individual firms'marginal cost curves above ATC.
d) vertical sum of the individual firms'marginal cost curves above ATC.

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In a perfectly competitive market, firm's short-run supply curve is the ...

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Solution chooses the correct option.

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