1. Then for each y > 0 M , the input distance function D(y,x) Proposition 8, D(y,x) is positive, monotonic and linearly homogeneous in x for x?? N . We first show that D(y,x) is a quasiconcave function of x over ? N;Suppose the technology set S satisfies properties P1-P4 and P8
2. Tilke, Max, or Karl Max
3. Modigliani and Miller (M⇐p;M) Proposition II