The risk that a portfolio's return will underperform the benchmark return is called the

tracking error

Explanation:  

As per the subject matter of finance, tracking error refers to the risk metric in a stock portfolio related to the portfolio administrator's actively managed funds choices; it shows how strongly a portfolio matches the standard to which it is thoroughly tested.

The most common indicator is perhaps the standard deviation of the portfolio-index return gap.Tracking error relates to the measure of the divergence from the baseline. Tracking error will not take into account risk (return) which is just a market activity feature.

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