Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Eric's career includes extensive work in ...

Robert Kelly is managing director of XTS Energy LLC, and has more than three decades of experience as a business executive. He is a professor of economics and has raised more than $4.5 billion in ...

The browser you are using is no longer supported on this site. It is highly recommended that you use the latest versions of a supported browser in order to receive an optimal viewing experience. The ...