An income trust is an investment that may hold equities, debt instruments, royalty interests or real properties. They are especially useful for financial requirements of institutional investors such as pension funds, and for investors such as retired individuals seeking yield. The main attraction of income trusts (in addition to certain tax preferences for some investors) is their stated goal of paying out consistent cash flows for investors, which is especially attractive when cash yields on bonds are low. Many investors are attracted by the fact that income trusts are not allowed to make forays into unrelated businesses: if a trust is in the oil and gas business it cannot buy casinos or motion picture studios.