Corner portfolio are calculated where a ___________.

The correct answer is: C. Security enters or leaves.

A corner portfolio is a portfolio that consists of all the assets in a market, with equal weights. It is calculated by taking the market portfolio and then removing one asset at a time. The resulting portfolio is the corner portfolio for the asset that was removed.

The corner portfolio is a useful tool for understanding the risk and return of a particular asset. It can also be used to construct a portfolio that is diversified against the risk of that asset.

Here is a brief explanation of each option:

• Option A: Security enters. This is not the correct answer because a corner portfolio is calculated by removing assets from the market portfolio, not adding them.
• Option B: Security leaves. This is not the correct answer because a corner portfolio is calculated by removing assets from the market portfolio, not adding them.
• Option C: Security enters or leaves. This is the correct answer because a corner
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