k. The degree of REIT and stock market integration or the stability of REIT betas over time (Ling and Naranjo, 1999; Glascock, Lu, and So, 2000; Chiang, Lee, and Wisen, 2005; Fei, Ding, and Deng, 2010; Liow and AddaeDapaah, 2010)
The degree of integration (of exchange-traded real estate companies, including REITs, to the exchange-traded (non-real-estate) stocks has significantly increased during the 1990s (Ling and Naranjo, 1999; Glascock, Lu, and So, 2000)
Beta of E-REITs slightly decrease from 1972 to 2002 betas using a single-factor model; but cannot make a conclusion using a three-factor model (Chiang, Lee, and Wisen, 2005)
REITs is good to diversify the S&P 500 portfolio since 1990 (S&P 500) (Fei, Ding, and Deng, 2010)
Capozza and Seguin (2003) REITs with greater insider holdings tend to invest in assets with lower systematic risk.