MARKET PERIOD: A period of time in which at all inputs in the production process are fixed, meaning the quantity of output itself is fixed. In other words, you've produced the good, you're not going to produced any more for now, all that remains is to sell it. You should compare market period with short run and production, long run and production, and very long run. See also | fixed input | variable input | perfectly inelastic | short-run production | long-run production | very long run |