Rodríguez-Álvarez, Ana; Rosal, Ignacio; Baños-Pino, José - In: Journal of Productivity Analysis 27 (2007) 1, pp. 73-83
, the input distance function, to empirically measure the effects of these factors. Although we suggest a general use of … industry, that of Spanish coal mining. We have estimated an equation system comprising an input distance function and cost …