Many readers may recall a time during the early 1980s when it was believed to be important to classify depression as either endogenous or exogenous. The idea was that there was a difference ...
An extensive literature in the social sciences analyzes peer effects among students, but estimation is complicated by several major problems some of which cannot be solved even with random assignment.
Free radicals can be generated from endogenous (originating in the body) sources and exogenous (originating outside the body) sources. Eating a diet rich in antioxidants can help prevent or reduce ...