Recognise it, it has happened to you too: a dinner, a bill and suddenly you don’t know who paid what. And there’s already the fuss. Talking about money doesn’t come out in romantic movies, but it’s the basis of a peaceful coexistence. The original source sums it up like this: there’s no single valid system, the important thing is to find the one that suits your reality. And look, not talking about it is also a decision, and it’s usually the wors…