Another way to generate passive income is to invest and be a silent partner in a business. This is very risky, but with risk comes the potential for high returns. For example, several years ago both Lyft and Uber were looking for private investors to invest in their companies. Today, they are worth billions - but you as an investor would only reap that benefit if they go public via an IPO, or get acquired. So, it's risky.

India receives an average annual rainfall of 1,208 millimetres (47.6 in) and a total annual precipitation of 4000 billion cubic metres, with the total utilisable water resources, including surface and groundwater, amounting to 1123 billion cubic metres.[157] 546,820 square kilometres (211,130 sq mi) of the land area, or about 39% of the total cultivated area, is irrigated.[158] India's inland water resources and marine resources provide employment to nearly six million people in the fisheries sector. In 2010, India had the world's sixth-largest fishing industry.[159]
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.