#9 Military pension/VA disability. Obviously requires a lot of front end effort in your 20s and/or 30s depending on length of service however once out and receiving it is totally passive with cost of living adjustment included most years. It has changed somewhat with new “blended retirement” plan but even those not staying past first or second enlistments often will get some VA rating. My wife got it on both ends of her service as the Navy paid for med school and then she was rated by VA after seven years active duty.
Book sales ($36,000 a year): Sales of How to Engineer Your Layoff" continue to be steady. I expect book sales to rise once the economy starts to soften and people get more nervous about their jobs. It's always best to be ahead of the curve when it comes to a layoff by negotiating first. Further, if you are planning to quit your job, then there is no downside in trying to engineer your layoff so you can get WARN Act pay for several months, a severance check, deferred compensation, and healthcare.
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.