Taylor Swift, at 33, is on her way to becoming America’s youngest self-made female billionaire and one of the few millennial magnates who hasn’t made her fortune from meme stocks and cryptocurrency. Her Eras Tour concert film, released Friday, had advance sales of more than $100m (€95m), which is expected to double within weeks. The tour itself has already become the highest-grossing concert series of all time and is on track to generate up to $4bn from ticket sales alone.