how do you predict opportunity cost 
any effort to make a prediction must rely heavily on estimates and assumptions there s no way of knowing exactly how a different course of action will play out financially over time investors might use the historic returns on various types of investments in an attempt to forecast the likely returns of their investment decisions however as the famous disclaimer goes past performance is no guarantee of future results 4the bottom linewhile opportunity costs can t be predicted with absolute certainty they provide a way for companies and individuals to think through their investment options and ideally arrive at better decisions 