Productivity in manufacturing and the length of the working day: evidence from the 1880 census of manufactures

Using micro-level data from the 1880 Census of Manufacturing, we estimate the elasticity of annual output with respect to the length of the working day. Holding labor and capital inputs constant and controlling for days of operation per month and months per year, this elasticity was positive but less than one, indicating diminishing returns. We also find diminishing returns to days per month and months per year, but these elasticities were significantly larger. Thus, decreases in daily hours coupled with an offsetting rise in annual days of operation would increase productive efficiency-precisely the kinds of changes then actually taking place. (C) 2003 Elsevier Science (USA). All rights reserved.