Excel and Google Sheets have three functions to calculate the internal rate of return: IRR, XIRR, and MIRR. Learn how these functions can calculate investment returns.

A Harvard scientist believes he's cracked the code proving there's a higher power at work, using a mind-bending scientific formula that's got social media in a philosophical spin. The Ivy League ...

Elasticity is an economic term that describes the responsiveness of one variable to changes in another. It commonly refers to how demand changes in response to price.