Investopedia explains 'R'
1. The ticker tape is updated in real time and informs investors about the price and volume at which a stock is trading and how its price compares to the previous day's close. During the day, it displays heavily traded stocks and the stocks of companies with major news most frequently; while the market is closed, it displays the closing prices of all publicly-traded stocks in alphabetical order.
2. In formulas, lower case "r" usually represents the required rate of return. RE is usually expected return. RM is usually the return on the market as a whole. Rf or Rrf is usually the risk free rate of return. R1, R2, R3, Ri are return in the first, second, third and ith period respectively.
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