1. Differences in Regional Prices: The United States, 1851–1880,;Coelho;JOURNAL,1974
2. Habakkuk, American and British Technology, p. 4; Rosenberg, The American System.
3. TOWARD UNDERSTANDING SOME PARADOXES IN CAPITAL THEORY
4. Detailed results from this and the following alternative simulations discussed in the text are reported in NBER Working Paper number 1504 or are available upon request from the authors.