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Original Message (ID '179032') By jf:
What you want is that the right side of "Data10 = ..." gets evaluated each time Data10 is used. The way to tell Mathematica this is by using ":=" instead of "=". Pension = 1000000; Risky = 0.6; Riskless = 0.4; riskfree = 0.04; mu = 0.12; sigma = 0.3; draw = 150000; Data10 := Data9*(Risky*Exp[mu + sigma*RandomReal[NormalDistribution[0, 1]]] + Riskless*Exp[riskfree]) - draw Do[Print[Data10], {100}] -150000+1.1205 Data9 -150000+1.13287 Data9 -150000+1.02558 Data9 ... See reference.wolfram.com/mathematica/ref/SetDelayed.html.