Don’t do vending machines as passive income. I thought it was passive but it’s way more than that. You have to work all the time. If you get a good account, you’ll be there twice a week. Want another job as a stable income? Good luck. What do you tell your boss when you have to go fix your machine because a dollar got stuck and is only open during normal business hours?

In equity valuation, residual income represents an economic earnings stream and valuation method for estimating the intrinsic value of a company's common stock. The residual income valuation model values a company as the sum of book value and the present value of expected future residual income. Residual income attempts to measure economic profit, which is the profit remaining after the deduction of opportunity costs for all sources of capital.