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Econ 221 Study Guide Lindahl Chapter 11 - BEHIND THE SUPPLY CURVE: INPUTS AND COSTS : *Production Function = -short run : quantity of a FIXED INPUT cannot be varied, but quantity of a variable input can. -long run : quantities of FIXED and VARIABLE inputs can be varied. -total product curve = shows how the quantity of output changes and the quantity of the VARIABLE input changes. -marginal product (of an input) = increase in output from using one more unit of that input. -diminishing returns to an input = when its marginal product declines as more of the input is used, holding the quantity of all other inputs fixed. -total cost = fixed cost + variable cost -due to dimin