| Robust standard errors in parentheses clustered by week | ||||||
| Share of Friendship Links | Team Members’ Ability: Coefficient of Variation | |||||
| Dependent Variable: | (1) | (2) | (3) | (4) | (5) | (6) |
| Team formed under rank incentives regime | |$ - .066$|*** | |$ - .074$|*** | |$ - .022$|*** | |$ - .018$|** | ||
| (.010) | (.013) | (.006) | (.008) | |||
| Team formed under tournament regime | |$ - .078$|*** | |$ - .086$|*** | |$ - .023$|*** | |$ - .020$|** | ||
| (.012) | (.015) | (.007) | (.008) | |||
| Team formed under second half of control regime | |$ - .017$| | |$ - .017$| | |$.007$| | |$.007$| | ||
| (.016) | (.016) | (.007) | (.007) | |||
| Team formed under first half of rank incentives regime | |$ - .064$|** | |$ - .013$| | ||||
| (.024) | (.013) | |||||
| Team formed under second half of rank incentives regime | |$ - .082$|*** | |$ - .023$|*** | ||||
| (.012) | (.007) | |||||
| Team formed under first half of tournament regime | |$ - .101$|*** | |$ - .020$|*** | ||||
| (.015) | (.005) | |||||
| Team formed under second half of tournament regime | |$ - .072$|*** | |$ - .019$| | ||||
| (.011) | (.014) | |||||
| P-value Test 1: Rank incentives = Tournament | |$[.424]$| | |$[.424]$| | |$[.840]$| | |$[.840]$| | ||
| P-value Test 2: Second half control = rank incentives | |$[.000]$| | |$[.043]$| | |$[.001]$| | |$[.086]$| | ||
| P-value Test 3: First half = Second half-rank incentives | |$[.481]$| | |$[.506]$| | ||||
| P-value Test 4: First half = Second half-tournament | |$[.018]$| | |$[.961]$| | ||||
| Adjusted R-squared | |$.080$| | |$.081$| | |$.083$| | |$.019$| | |$.019$| | |$.016$| |
| Observations | |$656$| | |$656$| | |$656$| | |$594$| | |$594$| | |$594$| |
| Robust standard errors in parentheses clustered by week | ||||||
| Share of Friendship Links | Team Members’ Ability: Coefficient of Variation | |||||
| Dependent Variable: | (1) | (2) | (3) | (4) | (5) | (6) |
| Team formed under rank incentives regime | |$ - .066$|*** | |$ - .074$|*** | |$ - .022$|*** | |$ - .018$|** | ||
| (.010) | (.013) | (.006) | (.008) | |||
| Team formed under tournament regime | |$ - .078$|*** | |$ - .086$|*** | |$ - .023$|*** | |$ - .020$|** | ||
| (.012) | (.015) | (.007) | (.008) | |||
| Team formed under second half of control regime | |$ - .017$| | |$ - .017$| | |$.007$| | |$.007$| | ||
| (.016) | (.016) | (.007) | (.007) | |||
| Team formed under first half of rank incentives regime | |$ - .064$|** | |$ - .013$| | ||||
| (.024) | (.013) | |||||
| Team formed under second half of rank incentives regime | |$ - .082$|*** | |$ - .023$|*** | ||||
| (.012) | (.007) | |||||
| Team formed under first half of tournament regime | |$ - .101$|*** | |$ - .020$|*** | ||||
| (.015) | (.005) | |||||
| Team formed under second half of tournament regime | |$ - .072$|*** | |$ - .019$| | ||||
| (.011) | (.014) | |||||
| P-value Test 1: Rank incentives = Tournament | |$[.424]$| | |$[.424]$| | |$[.840]$| | |$[.840]$| | ||
| P-value Test 2: Second half control = rank incentives | |$[.000]$| | |$[.043]$| | |$[.001]$| | |$[.086]$| | ||
| P-value Test 3: First half = Second half-rank incentives | |$[.481]$| | |$[.506]$| | ||||
| P-value Test 4: First half = Second half-tournament | |$[.018]$| | |$[.961]$| | ||||
| Adjusted R-squared | |$.080$| | |$.081$| | |$.083$| | |$.019$| | |$.019$| | |$.016$| |
| Observations | |$656$| | |$656$| | |$656$| | |$594$| | |$594$| | |$594$| |
Notes: The unit of observation is team i. The sample includes all teams that form from June 1st until October 1st for whom friendship links and ability measures can be constructed for. The dependent variable in Columns 1 to 3 is the share of friendship links in the team. This is computed as the number of worker pairs linked by a friendship tie over the total number of worker pairs that could be linked by a friendship tie. Individual ability is computed as the coefficient on the individual team member dummy in a regression of log team productivity on log worker’s picking experience, the log of the field life cycle plus one, a linear time trend, and field fixed effects. This is done for all workers that are observed picking on at least six field days in each of the regimes. The coefficient of variation in worker ability on any given team can then be constructed, and this is the dependent variable in Columns 4 to 6. We limit the sample to teams for who |$80\% $| of their members have either of these measures defined.
denotes significance at |$1\% $|,
at |$5\% $|, and * at |$10\% $|.
| Robust standard errors in parentheses clustered by week | ||||||
| Share of Friendship Links | Team Members’ Ability: Coefficient of Variation | |||||
| Dependent Variable: | (1) | (2) | (3) | (4) | (5) | (6) |
| Team formed under rank incentives regime | |$ - .066$|*** | |$ - .074$|*** | |$ - .022$|*** | |$ - .018$|** | ||
| (.010) | (.013) | (.006) | (.008) | |||
| Team formed under tournament regime | |$ - .078$|*** | |$ - .086$|*** | |$ - .023$|*** | |$ - .020$|** | ||
| (.012) | (.015) | (.007) | (.008) | |||
| Team formed under second half of control regime | |$ - .017$| | |$ - .017$| | |$.007$| | |$.007$| | ||
| (.016) | (.016) | (.007) | (.007) | |||
| Team formed under first half of rank incentives regime | |$ - .064$|** | |$ - .013$| | ||||
| (.024) | (.013) | |||||
| Team formed under second half of rank incentives regime | |$ - .082$|*** | |$ - .023$|*** | ||||
| (.012) | (.007) | |||||
| Team formed under first half of tournament regime | |$ - .101$|*** | |$ - .020$|*** | ||||
| (.015) | (.005) | |||||
| Team formed under second half of tournament regime | |$ - .072$|*** | |$ - .019$| | ||||
| (.011) | (.014) | |||||
| P-value Test 1: Rank incentives = Tournament | |$[.424]$| | |$[.424]$| | |$[.840]$| | |$[.840]$| | ||
| P-value Test 2: Second half control = rank incentives | |$[.000]$| | |$[.043]$| | |$[.001]$| | |$[.086]$| | ||
| P-value Test 3: First half = Second half-rank incentives | |$[.481]$| | |$[.506]$| | ||||
| P-value Test 4: First half = Second half-tournament | |$[.018]$| | |$[.961]$| | ||||
| Adjusted R-squared | |$.080$| | |$.081$| | |$.083$| | |$.019$| | |$.019$| | |$.016$| |
| Observations | |$656$| | |$656$| | |$656$| | |$594$| | |$594$| | |$594$| |
| Robust standard errors in parentheses clustered by week | ||||||
| Share of Friendship Links | Team Members’ Ability: Coefficient of Variation | |||||
| Dependent Variable: | (1) | (2) | (3) | (4) | (5) | (6) |
| Team formed under rank incentives regime | |$ - .066$|*** | |$ - .074$|*** | |$ - .022$|*** | |$ - .018$|** | ||
| (.010) | (.013) | (.006) | (.008) | |||
| Team formed under tournament regime | |$ - .078$|*** | |$ - .086$|*** | |$ - .023$|*** | |$ - .020$|** | ||
| (.012) | (.015) | (.007) | (.008) | |||
| Team formed under second half of control regime | |$ - .017$| | |$ - .017$| | |$.007$| | |$.007$| | ||
| (.016) | (.016) | (.007) | (.007) | |||
| Team formed under first half of rank incentives regime | |$ - .064$|** | |$ - .013$| | ||||
| (.024) | (.013) | |||||
| Team formed under second half of rank incentives regime | |$ - .082$|*** | |$ - .023$|*** | ||||
| (.012) | (.007) | |||||
| Team formed under first half of tournament regime | |$ - .101$|*** | |$ - .020$|*** | ||||
| (.015) | (.005) | |||||
| Team formed under second half of tournament regime | |$ - .072$|*** | |$ - .019$| | ||||
| (.011) | (.014) | |||||
| P-value Test 1: Rank incentives = Tournament | |$[.424]$| | |$[.424]$| | |$[.840]$| | |$[.840]$| | ||
| P-value Test 2: Second half control = rank incentives | |$[.000]$| | |$[.043]$| | |$[.001]$| | |$[.086]$| | ||
| P-value Test 3: First half = Second half-rank incentives | |$[.481]$| | |$[.506]$| | ||||
| P-value Test 4: First half = Second half-tournament | |$[.018]$| | |$[.961]$| | ||||
| Adjusted R-squared | |$.080$| | |$.081$| | |$.083$| | |$.019$| | |$.019$| | |$.016$| |
| Observations | |$656$| | |$656$| | |$656$| | |$594$| | |$594$| | |$594$| |
Notes: The unit of observation is team i. The sample includes all teams that form from June 1st until October 1st for whom friendship links and ability measures can be constructed for. The dependent variable in Columns 1 to 3 is the share of friendship links in the team. This is computed as the number of worker pairs linked by a friendship tie over the total number of worker pairs that could be linked by a friendship tie. Individual ability is computed as the coefficient on the individual team member dummy in a regression of log team productivity on log worker’s picking experience, the log of the field life cycle plus one, a linear time trend, and field fixed effects. This is done for all workers that are observed picking on at least six field days in each of the regimes. The coefficient of variation in worker ability on any given team can then be constructed, and this is the dependent variable in Columns 4 to 6. We limit the sample to teams for who |$80\% $| of their members have either of these measures defined.
denotes significance at |$1\% $|,
at |$5\% $|, and * at |$10\% $|.
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