There was an attempt made to build an economic simulator (really a special purpose analogue computer using water as the working medium) in the 1940s in New Zeal

There was an attempt made to build an economic simulator (really a special purpose analogue computer using water as the working medium) in the 1940s in New Zealand [1]. Terry Pratchett played with the concept in one of his books [2]. [1] http://en.wikipedia.org/wiki/MONIAC_Computer http://en.wikipedia.org/wiki/MONIAC_Computer [2] Making Money (2007)