system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
What is the expense ratio for an ETF?


assistant
An expense ratio reflects how much a mutual fund or an ETF (exchange-traded fund) pays for portfolio management, administration, marketing, and distribution, among other expenses. You'll almost always see it expressed as a percentage of the fund's average net assets (instead of a flat dollar amount).