So that's the expected return and efficient portfolio frontier problem.

这就是预期收益,和有效边界问题。

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The risk and return components of the efficient frontier are computed for a specific time period, usually one year.

FORBES: The Efficient Frontier

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But it also allows investors to craft allocations that are along the efficient frontier, getting the most return for the least volatility.

FORBES: Asset Allocation and the Efficient Frontier