For the most part, you need money to make money, as the old saying goes. That's because most ways of making passive income require an up-front investment. That's true of dividend stocks, which are one of the easiest ways to generate passive income.

However, the amount of money you need to invest to achieve your income goals varies depending on a stock's dividend yield. The higher the dividend yield, the lower the required investment.   

Two companies with big-time yields are Energy Transfer (NYSE: ET) and Crestwood Equity Partners (NYSE: CEQP). Here's a look at how much you'd need to invest into this high-yielding duo to achieve $1,000 of monthly income compared to other options.

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Source Fool.com