The author deals with the objections recently brought forward against marginal analysis as incorporated in the price theory. He begins by showing that practical economic thinking generally means ...

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...

Sean Ross is a strategic adviser at 1031x.com, Investopedia contributor, and the founder and manager of Free Lances Ltd. Ariel Courage is an experienced editor, researcher, and former fact-checker.

At the heart of economics lies a deceptively simple idea that shapes everything from market strategy to personal growth: marginal value theory. Those who adhere to it insist that when making decisions ...