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This paper examines the short-run dynamics of manufacturing costs by detailing how plants in the U. S. automobile industry change output. Weekly data show a variety of margins on which firms adjust production. These margins, which are distinct from the usual factor demand choices, differ in their lumpiness, their adjustment costs, and their variable costs. The existence of these margins explains several empirical puzzles of output fluctuations. Using a theory of the short-run dynamic cost function, we are able to infer some of the characteristics of the underlying cost function from the dynamic behavior of the different margins.