It's surely a small number, but how small would it have to be for you to take the risk? It's not a rational act to rob someone, so it's a fair assumption that t

It's surely a small number, but how small would it have to be for you to take the risk? It's not a rational act to rob someone, so it's a fair assumption that their next decision won't be solely based on reason or logic either. Mind you, we don't know the heart rate of the robber.