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Long-run supply curve of a purely competitive industry

Long-run supply curve of a purely competitive industry has a slope which is: (w) negative to offset the positive slope of each firm’s short-run supply. (x) positive to reflect the positive slope of each firm’s short-run supply. (y) dependent on whether this is an increasing, constant, or decreasing cost industry. (z) positive when firms reap economic profits, but negative when most suffer losses.

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