In his 2013 letter to shareholders, CEO Jeff Bezos noted, “We build automated systems that look for occasions when we’ve provided a customer experience that isn’t up to our standards, and those systems then proactively refund customers.” So if you are due a refund because your Amazon video doesn’t stream well, or there was a price drop on your pre-ordered product, Amazon doesn’t say “you must request such credit by phone or in writing.” Their computer already knows the refund is due, and...