Earlier quoted context omitted.
I'd argue that the privatization of the prison system is a gigantic driver behind increased cost and recidivism. For the same reason as I don't trust dating-services: the product makes less money if it succeeds in it's original purpose. So there will always be the conflict of interest between having a product that works as advertised, and a product that makes more money.
Less than 10% of prisoners in the US are in a privately run facility: https://www.sentencingproject.org/publications/private-priso...
> Since 2000, the number of people in private prisons has increased 47%, compared to an overall rise in the prison population of 9%.
2016 things changed a bit:
> At the federal level, a 2016 Obama Administration policy shift to reduce reliance and ultimately phase out private prison contracts was reversed by Attorney General Jeff Sessions in February 2017.
The article also answers whether this has any impact on the justice system:
> Changes in policy at the Department of Justice in 2017 that are likely to increase sentence length and expand prosecutions for drug and immigration offenses may contribute to the expansion of private facility contracting.