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Undergrads are taught many formulae for the Price Elasticity of Demand. The most common one I have encountered is the particularly unwieldy “midpoint formula”: The elasticity at one point is a little more reasonable: There…

I couldn’t find anything online to directly convert old Irish prices to current values. So I wrote some code to estimate e.g. £100 in 1950 in 2012 prices. It’s here: https://hargaden.com/enda/inflation/calculator.html