Suppose that historical data showed that returns of Japanese stocks and returns on U.S. stocks tended to

Question:

Suppose that historical data showed that returns of Japanese and returns on U.S. tended to move in opposite directions. Would it be better to own only one country's or to hold a mixture of the two? How would your answer change if the Japanese stock market always precisely mirrored the U.S. stock market?
Stocks
Stocks or shares are generally equity instruments that provide the largest source of raising funds in any public or private listed company's. The instruments are issued on a stock exchange from where a large number of general public who are willing...