In today's edition of "Ask a Fool," a reader poses a question to our retirement guru Robert Brokamp: "How should I invest small amounts in retirement accounts?" Rob has quite a few answers to this question. One is that you can always pursue a no-load mutual fund which will allow you to invest even small amounts regularly. Another is that many brokerage firms are now allowing investors to trade on certain ETFs without paying a brokerage fee. He also cautions investors to not let trading fees comprise more than 2% of their overall portfolios.

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