An average yield above 10% makes it easy to boost your passive income stream with these stocks.If you're concerned about having enough money during your retirement years, you're not alone. A recent survey by the AARP found that 61% of Americans over 50 years old worry they won't have enough to support themselves in retirement.Acquiring real estate to rent out is a popular way to set yourself up with more passive income, but each new tenant presents significant risks. Plus, managing properties isn't nearly a ...