In financial economics, there is a concept called the efficient frontier of investing. You can combine a portfolio of shares and other investments in many ways. In theory, there is one line which consists of the intersection of the best return for each level of risk (or alternatively, the lowest risk for each level of return),
While I was futilely trying to convince myself that the shoes I was trying on would become more comfortable with a bit more wear, in my annual shoe buying expedition, I realised that it’s quite a useful concept for shoes, as well.
In buying shoes, there is generally an optimal level of comfort for a given level of dagginess. So in buying shoes, I try to optimise comfort at the least stylish point on the curve I think I can get away with for a given occasion. Others will choose comfort, and optimise fashion, but either way we will end up in the same place.
In putting together the efficient frontier graph, I realised something else. Changing gender from female to male moves the line upwards AND makes it much flatter. The only place the two lines intersect is at running shoes.