The fees you pay to invest in mutual funds are “tumbling toward zero” thanks to the growing popularity of low-cost index fund investing and, more broadly, the growing realization among average investors that well-paid Wall Street guys can’t pick winning investments any better than you can.

“The rationale for human advisers paying high fees is the expectation of earning greater net returns than one’s peers over time. Yet research shows that the opposite is true,” says a new study. “There is no supportive justification for owning high-fee funds.”

A new study finds that a mere 0.07% of mutual funds were able to stay in the top 25% of funds for the past five years in a row. This is the zillionth piece of evidence pointing to the fact that you, the average jerk, should just buy cheap index funds and leave them alone.