It’s well-known that African-Americans make up a disproportionate part of the U.S. prison population. Racists of course have an easy explanation for this, but what is the real explanation? Part of it is probably racial profiling and bias among jury members. Another part of the explanation can be poverty, unemployment and lower education, burdens from which African-Americans also suffer disproportionately. And although crime has many possible causes, there’s some evidence that at least some types of property crime go up during recessions. This indicates that there’s a link between crime and poverty, something which in turn can explain different arrest ratios across races given the different poverty rates across races.
There’s an interesting paper here studying the effects of both labor market conditions and asset poverty on the property crimes involvement of American males. It turns out that poverty and labor market outcomes account for as much as 90% of the arrest rates ratio.