8. Business Functions Performed by Someone Else
You as the investor should not undertake to perform any business function. The only function you should perform, once the investment is made, is to receive the payments, and if payments are not made, you should be able to resort to a simple procedure at law to retrieve your money.
If you invest in a filling station you should not have to hire a manager and then proceed to sell gas and oil yourself, under our definition of the type of investment discussed here. The filling station should be leased to a major oil company for a fixed rental, and the oil company should perform all of the business functions.