During the 1926-2010 period the geometric mean return on small-firm stocks was ______. Investments Chapter 5 During the 1926-2010 period the geometric mean return on small-firm stocks was ______. A. 5.31% B. 5.56% C. 9.34% D. 11.80% Answer: D. 11.80% Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+