The more you open markets up, the less discrimination you get on grounds of 'taste' (racism). The stuff left over is usually 'statistical' (i.e. where certain groups are different in their average levels of job-relevant criteria). There was already a great paper showing this for the Fantasy Premier League (which I play avidly), but now there's also one for the real Premiership! Pierre Deschamps and José de Sousa look at the impact of the 1995 Bosman Ruling on the gap between black and white footballer wages in the English league. They find that when only 20 clubs competed for their skills, black players were underpaid relative to white ones, indicating that owners were able to indulge their preference against non-whites (or indulge their fans' preferences).
But once the whole of Europe were effectively on an equal footing, blacks became highly mobile and garnered equal pay for their efforts:
This paper assesses the impact of labor mobility on racial discrimination. We present an equilibrium search model that reveals an inverted U-shaped relationship between labor mobility and race-based wage differentials. We explore this relationship empirically with an exogenous mobility shock on the European soccer labor market. The Bosman ruling by the European Court of Justice in 1995 lifted restrictions on soccer player mobility.
Using a panel of all clubs in the English first division from 1981 to 2008, we compare the pre- and post-Bosman ruling market to identify the causal effect of intensified mobility on race-based wage differentials. Consistent with a taste-based explanation, we find evidence that increasing labor market mobility decreases racial discrimination.
The figure below shows how the 'turnover' (i.e. churn between clubs) of black English players jumped when European markets opened up. Market freedoms; exit; a sort of 'voting with their feet', outperformed voice in bringing equality. And we know from ASI research that this did not harm the English national team.