Personal residual income, often called discretionary income, is the amount of income or salary left over after debt payments, like car loans and mortgages, have been paid each month. For example, Jim’s take-home pay is $3,000 a month. His mortgage payment, home equity loan, and car loan are the following respective: $1,000, $250, and $200. Using a residual income calculator, Jim would calculate his RI to be $1,550 a month. This is the amount of money he has left over after his monthly debt payments are make that he can put into savings or use to purchase new assets.
First: I understand why you would say that such investments are restricted to only accredited investors, because generally, that’s true. There are means, under federal securities regulations and Blue Sky laws in each state, to sell interests to non-accredited investors – but usually those means are so heavily regulated and involve disclosures so similar to cumbersome registration requirements that it is not worth it for the seller to offer to non-accredited investors.
There are two primary types of public REITs: traded and non-traded. Publicly-traded REITs offer the benefits of liquidity, because it is traded openly on a stock exchange. However, this liquidity is likely to be priced into the value of the shares, resulting in a “liquidity premium”, or a cost that all investors pay for the ability to buy and sell the asset whenever they wish. The liquidity premium results in lower relative returns for all investors, regardless of whether or not they choose to sell their shares. Furthermore, publicly-traded REITs tend to be correlated to broader market volatility, meaning that the share value may fluctuate depending on how the stock market is doing, regardless of whether or not anything has changed with the underlying properties owned by the REIT.
6. Network Marketing: Network marketing is a unique business model and has made more millionaires than any other business. The industry as a whole is growing and more companies are trying to leverage referrals or direct sales to increase revenue and market products. However, the industry as a whole is confusing to most and requires a tremendous amount of mental and emotional fortitude to make residual income possible. Furthermore, the sustainability of that income vs. the effort you must put in is important to consider.

I agree mostly with the real estate advice. I’m looking for ways to take advantage of the condo I own to get up the rent from ~$0.90/ft to the $1.2-1.5/ft that seems more like the range in the same area. I’d have to put in a bit of capital (probably 10k on the low end for just the basics up to 40k if I wanted to remodel the kitchen and 2 bathrooms up to par with the area), so the return is likely there if those upgrades warrant $1.30/ft (given the unit is larger than most 2br/2ba in the area).
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.