The University of Warwick’s Andrew Oswald and his team compared survey data on the life satisfaction of more than 900,000 citizens of 27 European countries from 1980 to 2011 with data on annual advertising spending in those nations over the same period. The researchers found an inverse connection between the two. The higher a country’s ad spend was in one year, the less satisfied its citizens were a year or two later. Their conclusion: Advertising makes us unhappy.

A version of this article appeared in the January–February 2020 issue of Harvard Business Review.