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The problem of predicting interregional commodity movements and the regional prices of these commodities has intrigued economists, geographers and operations researchers for years. In 1838, A. A. Cournot (1838) discussed the equilibrium of trade between New York and Paris and noted how the equilibrium prices depended upon the transport costs. Enke (1951) recognized that this problem of predicting interregional flows and regional prices could be formulated as a network problem, and in 1952, . Paul Samuelson (1952) used the then recent advances in mathe matical programming to formalize the...

3 While all of these explanations seem to have merit, there is one dominant reason why the percentage of GDP and employment dedicated to services has continued to increase: low productivity. According to Baumol's cost disease hypothesis (Baumol, Blackman, and Wolff 1991), the growth in services is actually an illusion. The fact is that service-sector productivity is improving slower than that of manufacturing and thus, it seems as if we are consuming more services in nominal terms. However, in real terms, we are consuming slightly less services. That is, the increase in the service sector is...

3 While all of these explanations seem to have merit, there is one dominant reason why the percentage of GDP and employment dedicated to services has continued to increase: low productivity. According to Baumol's cost disease hypothesis (Baumol, Blackman, and Wolff 1991), the growth in services is actually an illusion. The fact is that service-sector productivity is improving slower than that of manufacturing and thus, it seems as if we are consuming more services in nominal terms. However, in real terms, we are consuming slightly less services. That is, the increase in the service sector is...