According to James J. Martin in "Men Against the State", Greene did not become a "full-fledged anarchist" until the last decade of his life, but his writings show that by 1850 he had articulated a Christian mutualism, drawing heavily on the writings of Pierre-Joseph Proudhon's sometimes-antagonist Pierre Leroux (see "Equality"; 1849 and "Mutual Banking"; 1850), writing in "The Radical Deficiency of Existing Circulating Medium" (1857): The existing organization of credit is the daughter of hard money, begotten upon it incestuously by that insufficiency of circulating medium which results from laws making specie the sole legal tender. The immediate consequences of confused credit are want of confidence, loss of time, commercial frauds, fruitless and repeated applications for payment, complicated with irregular and ruinous expanses. The ultimate consequences are compositions, bad debts, expensive accommodation-loans, law-suits, insolvency, bankruptcy, separation of classes, hostility, hunger, extravagance, distress, riots, civil war, and, finally, revolution. The natural consequences of mutual banking are, first of all, the creation of order, and the definitive establishment of due organization in the social body, and, ultimately, the cure of all the evils. which flow from the present incoherence and disruption in the relations of production and commerce.