My personal opinion is that in today’s new economy, it is wise to have multiple income streams. Reliance on one income source poses a risk to individuals, entrepreneurs, and even large corporations. A single-source income stream, rather it comes from a job, a million-dollar customer, or a highly targeted market segment can dry up for any number of reasons.I live in Michigan where many people derive their income from the auto industry. A downturn in that industry can affect masses of people in va.