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Alpha is a measure of the active return on an investment, the performance of that investment compared with a suitable market index.An alpha of 1% means the investment's return on investment over a selected period of time was 1% better than the market during that same period; a negative alpha means the investment underperformed the market.
In finance, Jensen's alpha [1] (or Jensen's Performance Index, ex-post alpha) is used to determine the abnormal return of a security or portfolio of securities over the theoretical expected return. It is a version of the standard alpha based on a theoretical performance instead of a market index .
Security characteristic line (SCL) is a regression line, [1] plotting performance of a particular security or portfolio against that of the market portfolio at every point in time. The SCL is plotted on a graph where the Y-axis is the excess return on a security over the risk-free return and the X-axis is the excess return of the market in general.
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Once the market reaches a new all-time high, it tends to keep going up for a long time. The S&P 500 closed at a record high 42 times through Sept. 27 this year. And that's far from an aberration.
Berkshire Hathaway is far from the only stock that has risen to a high share price. These are the most expensive stock shares as measured by the closing share price on Nov. 20. 1.