Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Once upon a time, there were three big truck engine makers in the U.S.: Caterpillar, Cummins, and Detroit. A couple of truck makers, like Mack and Volvo, offered their own engines. You ordered a truck ...