In the spirit of better investing and in celebration of the first Worldwide Invest Better Day coming up on Sept. 25, Motley Fool analysts will be answering user- and reader-submitted questions leading up to the big event. "Ask a Fool" anything, and we'll do our best to help you invest better.

In the following short video, senior analyst Anand Chokkavelu fields a question posed by reader Terry, who wonders, "If we get QE3, how should that affect REITs like NLY?"

"QE3" refers to the Federal Reserve's recently confirmed plan to lower long-term interest rates by buying up mortgage-backed securities, and "NLY" is Annaly Capital(NYSE:NLY)

The lowering of long-term interest rates will constrict the amount of spread these companies make, ultimately lowering their profitability as well as their potential to pay out dividends to shareholders -- which is the big attraction of mortgage REITs in the first place.

QE3 won't be a good thing for these companies. Watch the video for Anand's full take on the situation, including what else to keep in mind beyond the interest-rate spread.

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Anand Chokkavelu has no positions in the stocks mentioned above. The Motley Fool owns shares of Annaly Capital Management. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.