Read the article. Retitled article should read “Not all nudges work”. The interesting bit from the source article is that changes to the mean do not always ref

Read the article. Retitled article should read “Not all nudges work”. The interesting bit from the source article is that changes to the mean do not always reflect the value of the nudge. So, when judging a nudge, data should be spun various ways to determine impact on different segments of the population.