Use yahoo finance to find information for the common stock of Pfizer Corporation. Pfizer Inc. develops, manufactures, and sells healthcare products worldwide. It offers medicines and vaccines in various therapeutic areas, including cardiovascular metabolic and pain under the Eliquis, Chantix/Champix, and Premarin family brands; biologics, small molecules, immunotherapies, and biosimilars under the Ibrance, Sutent, Xtandi, Xalkori, Inlyta, Braftovi + Mektovi brands; and sterile injectable and anti-infective medicines under the Sulperazon, Medrol, Vfend, and Zithromax brands.

Q16: For this time frame [1925 to 2017], what has been the Geometric Average Return of the Market [Rm]?

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Q17 & Q18. Give the CAPM equation that is used to find the required return for a stock. Define all terms.

Q19 & Q20. Use this equation to estimate the "required return" for PFE stock. For simplicity, use the historic geometric returns as inputs in the equation. That is, assume that the future returns for the S&P500 and the risk free rate are the same going forward as they have been in the past.