1. Twenty-six days per month is the standard figure; see Lebergott, Manpower, p. 245.
2. Further evidence on American wage differentials, 1800–1830
3. For example, if two of the time period dummies were 1825 and 1826/27, the wage estimate for 1826 would be interpolated (that is, the coefficients of the time period dummies are centered on the midpoint of the period). All of the estimates for 1849 are interpolated, because we have yet to find reports for the year.
4. Hedonic Prices and Implicit Markets: Product Differentiation in Pure Competition
5. The conclusion is tentative until we can make similar comparisons for other regions.