Jeffrey Selbin and Justin McCrary study cited in The Wall Street Journal, August 28, 2014
[T]he Clean Slate intervention stems the earnings slide, and may even boost earnings (also independent of the economy). The data are not robust enough to say with certainty that earnings rise post-intervention—we only have 2-3 years of earnings information post-service and were able to collect earnings information on a small number of clients—but the trends are in the right direction.