I love how this diagram highlights that the adoption of ‘fun’ things is much more viral than the adoption of ‘efficient’ things. Of particular interest with this diagram is that it considers older innovations and how they took off. This is part of the allure of gamification…. making things fun.

This diagram is from the article “Household appliances and the use of time: the United States and Britain since the 1920s” by Sue Bowden and Avner Offer.  It was published in The Economic History Review, Volume 47, Issue 4, pages 725–748, November 1994.