The figure above shows a typical perfectly competitive corn
farm, whose marginal cost curve is MC and average total
cost curve is ATC. The market is initially in a long-run
equilibrium, where the price is $3.00 per bushel. Then, the market
demand for corn decreases and, in the short run, the price falls to
$2.50 per bushel.
In the new short-run equilibrium, how much does the farm
produce?