As t-bill pays 6 percent rate of return. would risk-averse investors invest in a risky portfolio that pays 12 percent with a probability of 40 percent or 2 percent with a probability of 60 percent, it's a No, because they are not rewarded with a risk premium.
Any asset can be used with the RoR as long as it is purchased once and generates cash flow at some point in the future. The attractiveness of various investments can be determined, in part, by comparing their historical rates of return to those of comparable assets.
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