Investing is big business, and a lot of people make a lot of money telling other people what to do with their money. Many investors are convinced they need to pay someone smarter than they are for financial advice. Read More: Self-Made Millionaires Suggest 5 Stocks You Should Never Sell Consider This: Mark Cuban Says Trump's Executive Order To Lower Medication Costs Has a 'Real Shot' -- Here's Why Morgan Housel, author of “The Psychology of Money,” has a different take. Here’s what she has to say about th ...