“…That is, investors who allocated some of their portfolio to share from other countries can increase the portfolio expected return with no increase in risk. The relationship between international stock price returns integrated have been investigated extensively (i.e, Stulz 1981, Jorion & Schmartz 1986, Taylor and Tonks 1989, Jeon and VonFurstenberg 1990, Arsharapalli and Doukas, 1993, Cheung and Ng 1992, Koop 1994, Lee and Kim 1994, Chowdury 1994, Arshanapalli, Doukas and lay 1995, Hassan and Naka 1996, Chaudhuri 1997, Lenchman 1998, Chen et al 2002, Diamands 2008, Wong et al 2005, Hoqut 2007, Li and Majerowskn 2008, Menon er al. 2009, Bastos and Caiado 2010, Park 2010, Subhani et al 2011, Horvah and Petrovski 2012, Tripathi and Sethi 2012, Thomas Dimpfl 2014, Srimivsan et al 2014.…”