Jennifer Barrett, chief education officer at Acorns and editor-in-chief of Grow, agrees with Goudreau. "Developing steady passive income streams can be a great way to supplement your regular paycheck and boost your bottom line," she tells Bustle. "Just be sure to do your homework ahead of time so you're aware of the costs and risks involved and realistic about the income you can expect. Investing regularly in the stock market can provide earnings over time from compounding market returns. But there are also ways to create steady streams of passive income that pay out at regular intervals — from investing in stocks that pay dividends and bonds that pay interest to investing in a rental property or renting out your own home."
Portfolio income can come from multiple sources – interest/bond coupons, stock dividends, financial strategies including derivatives and capital growth.  Each offers some cash flow and some also offer potential capital gain with some risk from liquidity and volatile prices.  In this low-yield environment, many investors rely too heavily on cash flows and to pursue this are venturing further into riskier areas than they’d normally consider.