Consider the following imaginary scenario. You are a researcher who has just discovered before anyone else the following pattern based on data from the period 1950-2020: companies in the S&P 500 that in the past six months have had their CEO replaced have substantially higher returns on average over the following 2 years than the other companies in the S&P 500. a) Describe an investment strategy exploiting this pattern that yields a positive profit on average. b) In the research paper you are writing to publicise this discovery, what concerns do you need to point out for investors to keep in mind before investing large chunks of their wealth in this strategy?