Ask HN: How much economics as an entrepreneur should i know?

Well I mean if you think about it. Economics seems to be a really important skill one can have while starting his startup. I mean a lot of things come into play creativity, empathy (psychology), maybe some sort of philosophy (helps take a moral and ethical decision), obviously Computer science too. But as coming to economics I am blank so as a new entrepreneur i want to know from you guys who have already done it and already doing it. Which pieces of economics are really important. In terms of psychology even if you can tell me something about Biases and common dilemmas that would be great to share too.