In a bold legislative move, in 2009 Germany introduced a fundamental reform of the government borrowing rules which are specified in its constitu-tion. In particular, state governments will be required to provide a balanced budget, abstracting from cyclical fluctuations, starting in the year...

Any researcher would certainly agree with Hamermesh's (1993:34) intuition about separability that the ease of substitution between any two production factors should be unaffected by a third factor that is separable from the others. This paper emphasizes that such a notion of separability needs...