The rise of contra legem and sine lege usages in french commercial law and jurisprudence (XVIIIe-XIXe siècles), some examples

Studying the impact of usages or customs in the world of business reveals the strength, or indeed the weakness, of the link between law and economics. One example alone could almost illustrate this, if we simply recall the age-old; ineffectual censure of usury by any number of jurists and canon lawyers. Yet interest-bearing loans became legal reality during the French Revolution. Usury is a practice contra legem which has become law. Like it or not, this usage is fact: a practical and economic reality. In this, it follows the traditional pattern of creating behaviours.