There's a huge trend that could change everything for the global economy, US businesses, and investors. You just have to ignore how bad it looks right now. In a recent note, Joe Quinlan highlighted the story of four middle class consumers in emerging markets and came to the conclusion that they exemplify the future of the world economy. "In the end, the world has changed—and for the better," wrote Quinlan. Join the conversation about this story » NOW WATCH: FORMER GREEK FINANCE MINISTER: The single largest threat to the global economy