This connection can be shown empirically, . for commodities. Gorton and Rouwenhorst show that the yields on commodities futures have a negative correlation with the yields on long-dated bonds and – for long holding periods – with equities. Commodities futures could therefore be employed effectively in order to diversify equity and bond portfolios. 4 On the other hand, according to Yee’s analysis, high correlation coefficients are evident in a comparison of the yields on financial assets with those of metal or energy producers or with REITs. 5 The connection with the stock market therefore predominates in this case. Investments in real.