The consideration in the present study is mainly conceptual. The objective is to showhow Data Envelopment Analysis (DEA) can be used to reveal the true input-output relationsin an industry. In the estimation of a production function it is assumed that allfirms use the existing technology...

This paper examines the long-run validity of purchasing power parity (PPP) for fourteen developing countries. The period examined is 1973:4 through 2002:8. The methods of Elliot, Rothemberg and Stock (1996), Kwiattkowski et al. (1992) and Geweke and Porter-Hudak (1983) are employed to detect the...