Western economies, particularly that of the United States, have been built in a very calculated manner on gratification, addiction, and unnecessary spending. Calculated, like in planned-economy, directive-from-the-top? I disagree. A lot of the "fluff," as the author describes it, is excess capital finding its way to things people find pleasurable, whether it be dope, travel, beauty, or rock and roll. Purveyors of suc…
Freeways are government projects, commissioned federally, given to private contractors, which setup cities, which enact a policy of sprawl reified by a small committee, of which only one member was elected, and for which in order for people to live in the city, they must purchase cars for themselves, appearing to the free market responding to the problem of getting around.
So at all levels, there is a mix of group-agency vs individual-agency: different concentrations of power.
Ultimately the chain of causality to create freeways and thus create demand for cars is started by a few people at the top.
But from the consumer's perspective, buying a car is a need combined with other luxury requirements to differentiate the car-driving experience to their tastes, and the market provides it. They don't always ask if there are alternative urban models that policy-makers could have tried.
See also lobbyists, that distort this process near the top as a bid to artificially create demand, or to stay solvent as economic actors without revenue from the free market. This also creates the illusion that the market is merely responding to consumer needs, when in fact it is constrained in ways that encourage specific consumer responses.