A study I heard discussed on a podcast once, and have been unable to subsequently locate, found that once you have accounted for failed private businesses the p

A study I heard discussed on a podcast once, and have been unable to subsequently locate, found that once you have accounted for failed private businesses the public sector was on par (and perhaps slightly better, though from memory they said it wasn't a statistically significant) with the private sector in terms of efficiency of output (i.e. what society gets for what is invested). If that rings any bells to anyone I would love to find the paper!