BDR

For decades it was normal practice for Copy Machine, Office Supply, Cell Phones, Life Insurance and Residential Real Estate companies to recruit and train (a little classroom) rookie salespeople and then have them spend years making Cold Calls.  Industries like those continue to suffer from the highest voluntary turnover rates you can imagine and the practice is not entirely different from what tech companies are doing with the BDR Role.  

But why?  Whose brilliant idea was this?