Considerations in Applying a Size Premium (Part III of III) In this third and final article, as displayed in Exhibits 1 through 4 in Part 1 of this three-part article, the size effect has been observed even when looking at recent periods starting in 1981 and 1990. If one holds that you should not apply the SP in the MCAPM and that beta should be the only measure of risk, one is supporting using the pure or ...