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This is actually sort of a combination of both shower thought and real world situation.
A client asked for assistance in calculating possible returns on a fully leveraged investment into markets given certain return profiles. The calculation of the FV is simple enough, but the actual ROI was what stumped me.
I agree that the risk profile is the more pertinent real-world issue, which we raised with the client. This is not an investment we would be handling for the client – he was asking for for assistance with the math.