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diagram of mutual fund fees

Sometimes the best way to grasp a complex concept is with a simple picture. The videos in “Big Ideas in Simple Sketches” offer illustrated insights from some of the best minds in money. The drawings may look pretty basic, but the thinking behind them will ultimately make you a better investor.

The average actively managed fund doesn't look expensive—what's 1.3% per year? A lot, says Charley Ellis, founder of financial consulting firm Greenwich Associates.

Read next: Why Stock Market Losses Feel More Extreme Than Gains

Think of expenses as a share of your expected returns. If long-run history repeats and stocks grow 10% a year, then 1.3% is 13% of that. And if stocks falter, you would give up an even bigger percentage of any gains to the fund manager.