Marginal cost estimation and fixed costs

[jbs02002]

Does anyone know of any papers that discuss estimation of marginal costs? In particular, I need some justification for the idea that when estimating cost as a function of sales, it is good practice to include an intercept term which represents fixed costs. Omission of the intercept would lead to inaccurate estimates of marginal cost.

[Aeshma]

read
Ackerberg, D., Benkard, L., Berry, S., and Pakes, A. (2006) "Econometric Tools for Analyzing
Market Outcomes", Forthcoming, Handbook of Econometrics
Ackerberg, D., K. Caves and G. Fraser (2004), ”Structural Identification of Production
Functions,” mimeo, UCLA.
for an introduction into production function estimation