On the Relevant Elasticity Estimates for Cost Structure Analyses of the Trucking Industry
指出，在评估产出质量对卡车运输企业成本的影响时，若以吨公里为给定条件，可能导致对产出质量效应的错误解读。
The effects of output qualities on costs of trucking firms could be evaluated at a given number of ton-kilometers or at a given number of shipments. This note shows that false interpretations of potential output qualities effects could occur when these effects are evaluated at a given number of ton-kilometers. Copyright 1990 by MIT Press.