Productivity. The panels show the time series for the average and dispersion of worker productivity on each day. The daily average productivity is computed as the weighted average of field-day worker productivity. The dispersion is computed as the weighted average of the field-day interquartile range (the difference between the productivity of the team at the 75th percentile and the productivity of the team at the 25th percentile) divided by average field-day productivity. In both cases weights are defined as the number of field man-hours worked on the field-day as a share of the total number of man-hours worked on the farm that day. The sample covers 109 days from 1 June to 6 October. Of these, 54 days are in the control regime, 24 in the rank incentive regime, and 30 in the tournament regime.