After bringing the war to a successful close, he was equally happy in adjusting the problems of peace, by establishing concord between the cities, and particularly by healing the dissensions between debtors and creditors. 3 For he ordained that the creditor should annually take two thirds of his debtor's income, and that the owner of the property should use the rest, and so on until the debt was cancelled.
https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Plutarch/Lives/Caesar*.html
Was it to replace debt jails? Also, I haven't seen an analysis of historic debt-to-income ratios.