Economic activity sometimes brings advanced technology to an enclave in a less-developed region where low-wage labor can be combined with skilled labor and capital from the advanced region to produce commodities for export to world markets. Potential skills of local workers may not be known to...

We present models that allow the use of unskilled and skilled labor as well as capital and land. Thus agriculture, important in developing countries, can be included as well as two types of labor and a single (or two) type(s) of physical capital. The models are related to the simple 3 × 2...