Decision based on your ROI

[slimbob]

Ok I want to ask a more precisely question:

Your ROI reflects that you have an edge over the other players. It is possible to convert your ROI into that edge so that you should call and push dependent of your ROI?
For example: If your ROi is 0% you have to call with any edge. But assuming you know your exactly ROI (assumption) what edge you need to call? Example: You know that you have an ROI of 20%. What edge do you need to call?

Regards
slimbob