Between 138bn with high degree of certainty/low risk and 1.33tn (or bust) with single-stocks, I'd take the 138bn any day. And to change the scale to k/m, I'd ta

Between 138bn with high degree of certainty/low risk and 1.33tn (or bust) with single-stocks, I'd take the 138bn any day. And to change the scale to k/m, I'd take 138k that I know will be there at my old age, than a coin-toss 1.33m (or bust). Diversification is to (overall) lower your risk and sleep better at night. Otherwise investing solely in single stocks, you could as well go to the races and bet on Land Cookie (an imaginary offspring of Sea Biscuit). EDIT: hindsight is (always) 20/20.