The market return is 12% and the risk free rate is 4%. Smallish Inc. has a market beta of 0.9, a SMB beta of 0.65, and a HML beta of .52. The risk premium on HML and SMB are both 2%. If the single factor model generates a regression coefficient of 0.8, using the Fama-French Three Factor Model, what is the different in returns between the Three-Factor model and the single factor model expected returns on Smallish Inc. stock

Google started as one of many internet search engines, amazon started as an online book seller, and ebay began as a site where people could sell used personal items in auctions. these firms have grown to be so large and dominant that they are facing antitrust scrutiny from competition regulators in the us and elsewhere. did these online giants grow by fairly beating competition, or did they use unfair advantages? are there any clouds on the horizon for these firms -- could they face diseconomies of scale or diseconomies of scope as they continue to grow? if so, what factors may limit their continued growth?