Should investors generally expect positive correlations between stocks and bonds? Bonds and bills? Stocks and real estate?

Question:

Should investors generally expect positive correlations between and bonds? Bonds and bills? and real estate? and gold?
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...