I know how to derive at the CAPM from a microeconomic foundation. In a recent University course I stumbled over a slide that derived the CAPM solely from the Sharpe ratio:
I cant come up with that steps by myself and it seems I am missing something down the line.
Do you guys here either have a source / video / etc. that derives the CAPM similarly in a step by step fashion? Or is someone here who could break the involved derivation steps into parts?