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Explained: Want to know how long your investment will take to double? Use Rule of 72

The Rule of 72 is a tool that assists investors in estimating investment growth duration. By dividing the rate of return into 72, one can predict how long doubling their investment will take.

  • Rule of 72 estimates time for investment to double based on rate of return
  • Divide 72 by annual rate of return to find doubling time in years
  • Determine required rate of return to double investment in set timeframe

New issue of Econ Journal Watch

Volume 23, Issue 2, September 2026 In this issue: “China shock” fragility: According to David Autor, David Dorn, and Gordon Hanson (2013), the “China shock” hit the United States from 1990 to 2007.

  • SFFA v. Harvard ruling in June 2023 predicts 50-70% Black enrollment decline in selective colleges
  • Michael Weissman disputes SARS-CoV-2 origin claim, citing evidence of earlier human introduction

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