Two things. One: Have you ever bought a digital book? And if you have...have you ever bought a physical one? Because saying Amazon sells ebooks at a big discount is a joke. New releases are typically about the same price as the hardcover in a store, and most of the older stuff you can pick up a physical copy from Amazon for way cheaper than a digital copy, to the point where the shipping is actually the most expensive part...especially since a lot of those books can cost pennies.
As for digital wallets for in store purchases...I really don't see the appeal. You're introducing a lot of insecurities (as everything that's connected to the internet has some) for something that does pretty much the exact same thing as a credit card, except with multiple steps, instead of just "Take card->Swipe". I guess I might see the appeal if you're one of those folks with twenty different cards in his wallet, but for us sensible folk, it's just an extra hassle.
Not to mention the obvious...what happens when the battery on your phone dies? Oops, lemme just go to my car and get my charger... If we went entirely to smartphones for EFT payments, we would use our smartphones less on the offchance that we want to buy something later in the day.
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