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In this, it has largely succeeded. Millions of people instinctively go to Amazon when they want to buy something online because they have come to trust the company in a way they trust few other online entities. Amazon’s technology, its interface, its one-click buying service — they are all incredibly easy to use. Its algorithms offer “suggestions” for further buying that actually appeal to its customers. Its Amazon Prime program — for a $79 annual fee you get two-day free shipping — is enormously popular. Unlike what happens at certain other technology companies, when you have a problem, the customer service telephone number isn’t hard to find. It is even willing to correct mistakes that it didn’t make, as I discovered over Christmas.

All of this, however, comes at a price. Indeed, as I’ve written before, customer service isn’t cheap. Certainly, a fair amount of the hundreds of millions of dollars Amazon has spent on R&D has gone toward developing, say, the Kindle, but a good deal of it has also gone toward improving the customer experience. Amazon is willing to lose money on some of its most popular items, like the latest Harry Potter novel. And even with Amazon Prime, it must surely swallow millions of dollars in shipping costs. Indeed, in a presentation to analysts in late November, the company’s chief financial officer, Thomas J. Szkutak, showed one slide that read, “Over $600 Million in Forgone Shipping Revenue.” And that was just for one year.

Wall Street, however, has never placed much value in Mr. Bezos’ emphasis on customers. What he has viewed as money well spent — building customer loyalty — many investors saw as giving away money that should have gone to the bottom line. “What makes their core business so compelling is that they are focused on everything the customer wants,” said Scott W. Devitt, who follows Amazon for Stifel Nicolaus & Company. “When you act in that manner many times Wall Street doesn’t appreciate it.” What Wall Street wanted from Amazon is what it always wants: short-term results. That is precisely what Dell tried to give investors when it scrimped on customer service and what eBay did when it heaped new costs on its most dedicated sellers. Eventually, these short-sighted decisions caught up with both companies.

But Mr. Bezos refused to give in. “He was spending his time on long-term value creation,” Mr. Miller said. There aren’t many chief executives who can so easily ignore the entreaties of the investment community, but Mr. Bezos turned out to be one of them. Of course it helps that he owns over 100 million shares of the stock — and is the company’s single largest shareholder.

And it also helps that his dogged pursuit of a better customer experience has turned out to be exactly right. Yes, it’s true that its international business has been growing rapidly, but that’s not the only reason Amazon is back in high-growth mode. Amazon says it has somewhere on the order of 72 million active customers, who, in the last quarter, were spending an average of $184 a year on the site. That’s up from $150 or so the year before. Amazon’s return customer business is off the charts. According to Forrester Research, 52 percent of people who shop online say they do their product research on Amazon. That is an astounding number.

There is simply no question that Mr. Bezos’s obsession with his customers — and the long term — has paid off, even if he had to take some hits to the stock price along the way. Surely, it was worth it. As for me, the $500 favor the company did for me this Christmas will surely rebound in additional business down the line. Why would I ever shop anywhere else online? Then again, there may be another reason good customer service makes sense. “Jeff used to say that if you did something good for one customer, they would tell 100 customers,” Mr. Kotha said.

I guess that’s what I just did.