Today, I’m going to teach you one of the hardest lessons for investors to learn…

It’s worth it to try, though. That most investors will never learn this concept gives those of us who do a huge advantage now and forever.

It may come as a shock, though… You may find it very hard to believe… But it’s key to the success of some of the world’s most successful investors…

Gross domestic product (GDP) growth and stock market returns have just about nothing to do with one another. In fact, you can achieve great investment results without ever thinking about another “macro” issue again.

Most people base their investing decisions on economic data, forecasts, and what they hear in the media. They obsess over unemployment numbers… the Producer Price Index… housing numbers… interest rates… factory orders… industrial capacity utilization… the Baltic Freight rate…

But the wisest, richest investors in the world say to forget it.

Business partners and billionaire investors Warren Buffett and Charlie Munger, for example, have been investing their own and other people’s money for 47 years. And in all that time, they claim they’ve never had a single conversation about the economy. They simply don’t waste time on it.

The vice chairman of investment firm Fidelity, Peter Lynch, is one of America’s top money managers. He says if you spend 13 minutes thinking about economic and market forecasts, you’ve wasted 10 minutes. It’s just not worth thinking about.

Ben Inker of the money-management firm Grantham, Mayo, and Van Otterloo recently wrote