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The Perpetual Motion Money Machine      
T Discount Rate (risk-free or low risk)    
R Assumed investment return (assuming investment risk)    
N # of years    
D Dollars invested today    
E Expected value of dollars D in N years at return R   E = D*(1+R)^N
P Present value of expected value E at risk-free discount rate T   P = E/((1+T)^N)
A Expected compensation for risk of return stream   A = P-D

Automatic recalculation