The problem with measuring a 2016 economy using 1940s methods (Diane Coyle, WEF)

Britain’s tallest mountain is Ben Nevis in Scotland. Recently, it became one metre taller, standing now at 1 345m rather than 1 344m above sea level. Of course, the mountain did not actually grow. Rather, the team of Ordnance Survey experts who re-measured it for the first time since 1949 were able to do so more accurately because of improvements in technology, and specifically through the use of GPS.

https://www.weforum.org/agenda/2016/04/the-problem-with-measuring-a-2016-economy-using-1940s-methods