rates and calories varied with economic development. During the 19th century, black physical activity and net nutrition … expectancy was not likely due to improved nutrition. Physically active farmers had greater BMRs and received more calories per … day than workers in other occupations. Black diets, nutrition, and calories varied by residence, and rural blacks in the …

expectancy increased at the same time that nutrition decreased, indicating that the most important source of increased life … expectancy was not improved nutrition. Physically active farmers had greater BMRs and received more calories per day than workers … in other occupations. White diets, nutrition, and calories varied by residence, and whites in the rural Deep South …

We conduct a field experiment in a naturally occurring labor environment and track whether the performance of workers …

This paper presents evidence from a field experiment, which aims to identify the two sources of workers’ pro …

This paper presents the results of a randomized experiment analyzing the use of vouchers for adult training. In 2006, 2 … aware at any time that they were part of an experiment. The experiment shows that the voucher had a significant causal …

interactions may be important because children enjoy spending time with other children or parents learn from other parents about … due to changes in parents’ perception of their children’s ability. … the ability of their children. Identification is based on a randomized intervention that grants a cash subsidy encouraging …

that both forces are at play. We conduct a natural field experiment where, in a randomly assigned part of a residential …

This paper reports the results from a controlled field experiment designed to investigate the causal effect of public …