What is necessary is to restore usury laws, capping interest rates, and to prohibit increases of interest rates on debt already incurred at one rate.
In the largest view, it is necessary to raise wage levels. Credit at usurious rates has served as a means of propping up consumption at levels that cannot be sustained by people's actual incomes, which have not risen even though the productivity of labor has increased greatly by all standard measures. If these productivity increases were expressed by increased wages rather than increased profits, we would have a healthy economy, and very few credit cards in circulation.