Yes, the M language is used for the rules and calculations, though you have many other applications in python. This presentation[0] gives more info about why. T

Yes, the M language is used for the rules and calculations, though you have many other applications in python. This presentation[0] gives more info about why. TL;DR it started in the '80s. [0] https://forum.openfisca.fr/t/presentation-du-code-source-en-langage-m/52 https://forum.openfisca.fr/t/presentation-du-code-source-en-...