American Express is an incredible business with a strong premium brand, very resilient customers and a model that is hard to copy, strong enough to consider swapping it in for Visa or Mastercard. Demand for Platinum and Gold cards is very strong among people under 35 who love the rewards, bringing in wealthy young customers who can drive growth for a long time. Amex also has room to expand through new partnerships that make its cards accepted everywhere. x.comÂ