What Could Lift Visa Stock?

Visa (V) stock returned 6.3% over the past twelve months, against 16.0% for the S&P 500, so you have watched the market pull ahead. The stock is priced about as usual: it trades at 30.0 times trailing earnings, against an average of 29.8 at its quarter-ends over three years. So what would have to go right at Visa for the stock to do better.