Before long, the Michigan Truck Plant was the most profitable of Ford's fifty-three assembly plants. By the late nineteen-nineties, it had become the most profitable factory of any industry in the world. In 1998, the Michigan Truck Plant grossed eleven billion dollars, almost as much as McDonald's made that year. Profits were $3.7 billion.

The truth, underneath all the rationalizations, seemed to be that S.U.V. buyers thought of big, heavy vehicles as safe: they found comfort in being surrounded by so much rubber and steel. To the engineers, of course, that didn't make any sense, either: if consumers really wanted something that was big and heavy and comforting, they ought to buy minivans, since minivans, with their unit-body construction, do much better in accidents than S.U.V.s. (In a thirty-five-m.p.h. crash test, for instance, the driver of a Cadillac Escalade--the G.M. counterpart to the Lincoln Navigator--has a sixteen-per-cent chance of a life-threatening head injury, a twenty-per-cent chance of a life-threatening chest injury, and a thirty-five-per-cent chance of a leg injury. The same numbers in a Ford Windstar minivan--a vehicle engineered from the ground up, as opposed to simply being bolted onto a pickup-truck frame--are, respectively, two per cent, four per cent, and one per cent.) But this desire for safety wasn't a rational calculation. It was a feeling. Over the past decade, a number of major automakers in America have relied on the services of a French-born cultural anthropologist, G. Clotaire Rapaille, whose speciality is getting beyond the rational--what he calls "cortex"--impressions of consumers and tapping into their deeper, "reptilian" responses. And what Rapaille concluded from countless, intensive sessions with car buyers was that when S.U.V. buyers thought about safety they were thinking about something that reached into their deepest unconscious. "The No. 1 feeling is that everything surrounding you should be round and soft, and should give," Rapaille told me. "There should be air bags everywhere. Then there's this notion that you need to be up high. That's a contradiction, because the people who buy these S.U.V.s know at the cortex level that if you are high there is more chance of a rollover. But at the reptilian level they think that if I am bigger and taller I'm safer. You feel secure because you are higher and dominate and look down. That you can look down is psychologically a very powerful notion. And what was the key element of safety when you were a child? It was that your mother fed you, and there was warm liquid. That's why cupholders are absolutely crucial for safety. If there is a car that has no cupholder, it is not safe. If I can put my coffee there, if I can have my food, if everything is round, if it's soft, and if I'm high, then I feel safe. It's amazing that intelligent, educated women will look at a car and the first thing they will look at is how many cupholders it has." During the design of Chrysler's PT Cruiser, one of the things Rapaille learned was that car buyers felt unsafe when they thought that an outsider could easily see inside their vehicles. So Chrysler made the back window of the PT Cruiser smaller. Of course, making windows smaller--and thereby reducing visibility--makes driving more dangerous, not less so. But that's the puzzle of what has happened to the automobile world: feeling safe has become more important than actually being safe.