In modern portfolio theory, a dot is placed on the x axis and moves up or down to get closer to where you want to be. The efficient frontier was originally developed by markoitz in 19 52 but has since been expanded with help from other thinkers like eugene fama who came behind him. In most cases, when i was a planter, this was a great way to make these data driven decisions about what investment classes were important to our port lio. And now inside of that asset class, i can make decisions about which investments are right.