Since the rise of the small-sum lending industry in the 1890s, people on the lowest rungs of the economic ladder in the United States have been asked to pay the greatest price for credit. Again and again, Americans have asked why the most fragile borrowers face the highest costs for access to the smallest loans. To protect low-wage workers in need of credit, reformers have repeatedly turned to law, only to face the vexing question of where to draw...