Technical change is inherently unobservable and has conventionally been represented by proxy variables, from simple time trends to more sophisticated knowledge stock variables. This paper follows Lambert and Shonkwiler (1995) in modelling technical change as a stochastic unobservable variable...

Cointegration techniques were used to identify valid long-run relationships between macroeconomic variables and agriculture. Then, identifying restrictions were imposed on a VAR system and three long-run equilibrium relationships were found, with exports, the real price of outputs and net farm...

This paper considers epistemology in economics, looking at the ways in which theory, observation and measurement are combined. Agricultural economics is a policy science and so scientific research programmes operate simultaneously with political action programmes. Taking policy positions and...

The purchase of commercial farm land in Zimbabwe for resettlement has been a factor in government policy since independence in 1980, but from l 980 to 1989 only 52 000 families were relocated. The Land Acquisition Bill of 1992 made compulsory purchase easier and at present the government has...

This paper applies cointegration techniques to a model of induced innovation based on the two-stage constant elasticity of substitution (CES) production function. This approach results in direct tests of the inducement hypothesis, which are applied to data for South African commercial...