The sales director of the Flemington Nissan dealership in the central New Jersey town of Flemington is a man named Bob Golomb. Golomb is in his fifties, with short, thinning black hair and wire-rimmed glasses. He wears dark, conservative suits, so that he looks like a bank manager or a stockbroker. Since starting in the car business more than a decade ago, Golomb has sold, on average, about twenty cars a month, which is more than double what the average car salesman sells. On his desk Golomb has a row of five gold stars, given to him by his dealership in honor of his performance. In the world of car salesmen, Golomb is a virtuoso.

Being a successful salesman like Golomb is a task that places extraordinary demands on the ability to thin-slice. Someone you’ve never met walks into your dealership, perhaps about to make what may be one of the most expensive purchases of his or her life. Some people are insecure. Some are nervous. Some know exactly what they want. Some have no idea. Some know a great deal about cars and will be offended by a salesman who adopts a patronizing tone. Some are desperate for someone to take them by the hand and make sense of what seems to them like an overwhelming process. A salesman, if he or she is to be successful, has to gather all of that information—figuring out, say, the dynamic that exists between a husband and a wife, or a father and a daughter—process it, and adjust his or her own behavior accordingly, and do all of that within the first few moments of the encounter.

Bob Golomb is clearly the kind of person who seems to do that kind of thin-slicing effortlessly. He’s the Evelyn Harrison of car selling. He has a quiet, watchful intelligence and a courtly charm. He is thoughtful and attentive. He’s a wonderful listener. He has, he says, three simple rules that guide his every action: “Take care of the customer. Take care of the customer. Take care of the customer.” If you buy a car from Bob Golomb, he will be on the phone to you the next day, making sure everything is all right. If you come to the dealership but don’t end up buying anything, he’ll call you the next day, thanking you for stopping by. “You always put on your best face, even if you are having a bad day. You leave that behind,” he says. “Even if things are horrendous at home, you give the customer your best.”

When I met Golomb, he took out a thick three-ring binder filled with the mountain of letters he had received over the years from satisfied customers. “Each one of these has a story to tell,” he said. He seemed to remember every one. As he flipped through the book, he pointed randomly at a short typewritten letter. “Saturday afternoon, late November 1992. A couple. They came in with this glazed look on their faces. I said, ‘Folks, have you been shopping for cars all day?’ They said yes. No one had taken them seriously. I ended up selling them a car, and we had to get it from, I want to say, Rhode Island. We sent a driver four hundred miles. They were so happy.” He pointed at another letter. “This gentleman here. We’ve delivered six cars to him already since 1993, and every time we deliver another car, he writes another letter. There’s a lot like that. Here’s a guy who lives way down by Keyport, New Jersey, forty miles away. He brought me up a platter of scallops.”

There is another even more important reason for Golomb’s success, however. He follows, he says, another very simple rule. He may make a million snap judgments about a customer’s needs and state of mind, but he tries never to judge anyone on the basis of his or her appearance. He assumes that everyone who walks in the door has the exact same chance of buying a car.

“You cannot prejudge people in this business,” he said over and over when we met, and each time he used that phrase, his face took on a look of utter conviction. “Prejudging is the kiss of death. You have to give everyone your best shot. A green salesperson looks at a customer and says, ‘This person looks like he can’t afford a car,’ which is the worst thing you can do, because sometimes the most unlikely person is flush,” Golomb says. “I have a farmer I deal with, who I’ve sold all kinds of cars over the years. We seal our deal with a handshake, and he hands me a hundred-dollar bill and says, ‘Bring it out to my farm.’ We don’t even have to write the order up. Now, if you saw this man, with his coveralls and his cow dung, you’d figure he was not a worthy customer. But in fact, as we say in the trade, he’s all cashed up. Or sometimes people see a teenager and they blow him off. Well, then later that night, the teenager comes back with Mom and Dad, and they pick up a car, and it’s the other salesperson that writes them up.”

What Golomb is saying is that most salespeople are prone to a classic Warren Harding error. They see someone, and somehow they let the first impression they have about that person’s appearance drown out every other piece of information they manage to gather in that first instant. Golumb, by contrast, tries to be more selective. He has his antennae out to pick up on whether someone is confident or insecure, knowledgeable or naïve, trusting or suspicious—but from that thin-slicing flurry he tries to edit out those impressions based solely on physical appearance. The secret of Golomb’s success is that he has decided to fight the Warren Harding error.

Why does Bob Golomb’s strategy work so well? Because Warren Harding errors, it turns out, play an enormous, largely unacknowledged role in the car-selling business. Consider, for example, a remarkable social experiment conducted in the 1990s by a law professor in Chicago named Ian Ayres. Ayres put together a team of thirty-eight people—eighteen white men, seven white women, eight black women, and five black men. Ayres took great pains to make them appear as similar as possible. All were in their mid-twenties. All were of average attractiveness. All were instructed to dress in conservative causal wear: the women in blouses, straight skirts, and flat shoes; the men in polo shirts or button-downs, slacks, and loafers. All were given the same cover story. They were instructed to go to a total of 242 car dealerships in the Chicago area and present themselves as college-educated young professionals (sample job: systems analyst at a bank) living in the tony Chicago neighborhood of Streeterville. Their instructions for what to do were even more specific. They should walk in. They should wait to be approached by a salesperson. “I’m interested in buying this car,” they were supposed to say, pointing to the lowest-priced car in the showroom. Then, after they heard the salesman’s initial offer, they were instructed to bargain back and forth until the salesman either accepted an offer or refused to bargain any further—a process that in almost all cases took about forty minutes. What Ayres was trying to do was zero in on a very specific question: All other things being absolutely equal, how does skin color or gender affect the price that a salesman in a car dealership offers?

The results were stunning. The white men received initial offers from the salesmen that were $725 above the dealer’s invoice (that is, what the dealer paid for the car from the manufacturer). White women got initial offers of $935 above invoice. Black women were quoted a price, on average, of $1,195 above invoice. And black men? Their initial offer was $1,687 above invoice. Even after forty minutes of bargaining, the black men could get the price, on average, down to only $1,551 above invoice. After lengthy negotiations, Ayres’s black men still ended up with a price that was nearly $800 higher than Ayres’s white men were offered without having to say a word.

What should we make of this? Are the car salesmen of Chicago incredible sexists and bigots? That’s certainly the most extreme explanation for what happened. In the car-selling business, if you can convince someone to pay the sticker price (the price on the window of the car in the showroom), and if you can talk them into the full premium package, with the leather seats and the sound system and the aluminum wheels, you can make as much in commission off that one gullible customer as you might from half a dozen or so customers who are prepared to drive a hard bargain. If you are a salesman, in other words, there is a tremendous temptation to try to spot the sucker. Car salesmen even have a particular word to describe the customers who pay the sticker price. They’re called a lay-down. One interpretation of Ayres’s study is that these car salesmen simply made a blanket decision that women and blacks are lay-downs. They saw someone who wasn’t a white male and thought to themselves, “Aha! This person is so stupid and naïve that I can make a lot of money off them.”