It's a difficult question, because we've been at this for fifty years. We've built what we think is a wonderful brand, invested billions of dollars, and have 30 million merchants that accept Visa globally. Do I think someone can come along and replicate that quickly? No, but there are a couple of things that I want to point out.
We do see new entrants in our business all the time. PayPal had almost no position five years ago; now it has almost 5% of the e-commerce business on the Internet. They've done a wonderful job and have challenged the way we think about innovation and investment in that channel. Likewise, MasterCard, American Express, and domestic debit schemes such as Interac are vigorous and challenging competitors that keep us on our toes.
The thing that I think gets lost sometimes in our business model is that when you think about interchange, it is a flow from an acquiring financial institution to an issuing financial institution, but it's not just one issuing financial institution. The same revenue steam goes to multiple financial institutions, and even though all the cards may be branded “Visa” in our system, they're all competing with one another for the consumer's business. Through that competition, the consumer wins in lower fees and better features. So we think the competition that sits within the network and across all the banks is healthy, and we do see new entrants that change the way we think about payments and change the way consumers value payments.