π represents the equalized profit rate in Das Kapital vol3 ch9-10… or rather, that’s how it is referred in the literature. I just checked the primary source and Marx actually labeled it p’.

'We can use pi too! We're a real science! We have a Nobel and everything! '

What a stupid idea, there are so many letters, Greek and otherwise, why use the one that famously represents a specific number

It is pi, the name of the greek letter is pi. Maybe you mean it's not 3.1415

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