Alley-oops as workplace cooperation 

 Here's a paper for the "high internal, low external validity" file (via Kevin Lewis): 

 Interracial Workplace Cooperation: Evidence from the NBA

 Joseph Price, Lars Lefgren & Henry Tappen 
NBER Working Paper, February 2009 

 Abstract: 
Using data from the National Basketball Association (NBA), we examine 
whether patterns of workplace cooperation occur disproportionately 
among workers of the same race. We find that, holding constant the 
composition of teammates on the floor, basketball players are no more 
likely to complete an assist to a player of the same race than a 
player of a different race. Our confidence interval allows us to 
reject even small amounts of same-race bias in passing patterns. Our 
findings suggest that high levels of interracial cooperation can occur 
in a setting where workers are operating in a highly visible setting 
with strong incentives to behave efficiently.