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Is there a term for the risk of investing in an asset with a positive but inferior return?
I'm sorry for adding another answer @MatthewFlaschen but it is too long for a comment. It depends on the situation. Say you buy shares of the Apple Inc. and want to know what is the lost opportunity cost. You need to find out what other opportunities are. In other words what are the other possible types of investments you consider. For example in theory you could try to invest in any company from S&P 500, but is it really possible (I don’t mean investing directly in index) . Are you really capable of researching each company.  So in your case you would consider only a few companies as alternative solutions. Also after different time period each choice may be your lost opportunity cost.  To measure the risk you have to: In conclusion I want to say that my goal was to picture in general how the process looks. Also this is just an exemplary answer. All is about in what finance field you are interested. For example in one field you use Internal Rate of Return and in other Value at Risk. Opportunity cost is to vague to exactly tell how measure its risk of wrong anticipation. It connects in every finance field and in every field you have different ways do deal with it. If you specify your question more, maybe someone will provide a better answer.