Why is it so difficult to study discrimination outside the sports industry? Outside of the sports industry, the world is

[answerhappygod]

Why is it so difficult to study discrimination outside the
sports industry?
Outside of the sports industry, the world is full of monopolists
that have market power.
The labor market is so large, it would be hard to study
something of that size.
Outside of sports, productivity is hard to measure.
The elasticity of demand in a non-sports industry is very hard
to calculate.
Who was the first African professional baseball player, and when
did he play?
Jackie Robinson from 1947-1956
Bud Fowler from 1878 to 1895
Willie Mays from 1952-1957
Hank Aaron from 1954-1971
What was reported involving implicit bias and NBA referees ?
The study of NBA referees found evidence for implicit bias with
respect to the scheduling of games.
The NBA does not have referees.
The study of NBA referees found no evidence of implicit
bias.
The study of NBA referees found evidence for implicit bias with
respect to the calling of fouls.
The Later regression studies of wage discrimination in the NBA
cited in the textbook did not detect discrimination
restricted their sample to non-free agents
because the samples used had players for which employers had
less monopsony control of wages
because the samples used had players for which employers had
more monopsony control of wages
reported results of paying a lower salary to tall black
players