[BeFlatXIII]

It is equally naive to assume that a retail investor could judge which professional fund managers are scammers, which are rainmakers, and which have a real edge.

[eru]

That's why as a retail investor you put your money in low cost index funds.

It's easy to compare costs of funds: you can find them in the prospectus and the funds advertise them.

(If a fund makes it hard to find out the fees and costs, no need to sweat it: they are likely high, so you are safe avoiding that fund.)