Computadora hidro-keynesiana:

(...) The MONIAC was approximately two meters high, 1.2 meters wide and almost a meter deep, and consisted of a series of transparent plastic tanks and pipes which were fastened to a wooden board. Each tank represented some aspect of the UK national economy and the flow of money around the economy was illustrated by coloured water. At the top of the board was a large tank called the treasury. Water [i.e. money] flowed from the treasury to other tanks representing the various ways in which a country could spend its money. For example, there were tanks for health, and education. To increase spending on health care a tap could be opened to drain water from the treasury to the tank which represented health spending. Water then ran further down the model to other tanks, representing other interactions in the economy. Water could be pumped back to the treasury from some of the tanks to represent taxation. Changes in tax rates were modeled by increasing or decreasing pumping speeds. (...) [link]

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