This question already has an answer here:

Fidelity, Ameritrade, Vanguard and now Schwab offer no transaction fees ETFs.

  1. how do they make money by selling these ETFs ?
  2. what's the catch ?

merged by JoeTaxpayer Mar 2 at 12:00

This question was merged with No transaction fee ETF trades - what's the catch? because it is an exact duplicate of that question.

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