Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Robert Kelly is managing director of XTS ...

Andriy Blokhin has 5+ years of professional experience in public accounting, personal investing, and as a senior auditor with Ernst & Young. Erika Rasure is globally-recognized as a leading consumer ...

THE father of consumer choice theory, Alfred Marshall, believed that the more of something you have the less of it you want: a phenomenon economists call diminishing marginal utility. However this was ...