Skin to Buck Ratio (SBR)

When selecting a prostitute, the optimal rental criteria is finding the fattest and oldest hoe with the most skin for your dollar, to maximize your investment's worth in the night.
SI Unit is meter squared per USD

Man, Jimmy is such an idiot! He picked the skinny twenty year old hooker when he had a chance to pick up that Granny Gorlock at the end of the street! He didn't pay attention to the Skin to Buck Ratio (SBR).