If the average output per worker in a firm is 7 units per hour, then the average output will rise as a result of hiring another worker if *
the marginal worker produces 7 units.
more workers are hired.
the marginal output of the next worker exceeds 7.
the last worker produced less than 7 units.
The long-run ATC curve of a competitive firm derives its shape from: *
decreasing, then increasing, short-run returns.
increasing, then decreasing, short-run returns.
economies, then diseconomies, of scale.
diseconomies, then economies, of scale.