If you're thinking of investing in Pfizer (NYSE: PFE) to generate some passive income from your portfolio, you won't need to spend very much to do so, provided that you're willing to play the long game. 

In fact, getting $500 in annual dividends from this stock is almost certainly within reach for you, as long as you have enough patience to wait a few years. Here's how. 

Building up a passive income stream is often a lot more manageable when you can do it piece by piece rather than paying out a large lump sum. Dollar-cost averaging (DCA) refers to buying a few shares of a stock here and there over a period of time so that you don't need a lump sum to reach your target position size. The longer you're willing to spend building up your position, the less money you need to commit at any given interval. 

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Source Fool.com