As the band prepares to tour, economists say pent-up global demand could reshape how concerts boost city economiesMove over, Taylor Swift. Her Eras tour was the highest grossing in history, sparking an estimated $5bn in direct consumer spending across the US. But now another musical phenomenon is preparing to sweep through North America – and economists expect it will generate tens of billions of dollars in economic activity along the way.K-pop sensation BTS will embark this year on their...