IN our society, cars receive considerable attention and study  whether the subject is buying and selling them, the traffic congestion they cause or the dangerous things we do in them, like texting and talking on cellphones while driving. But we haven’t devoted nearly enough thought to how cars are usually deployed  namely, by sitting in parking spaces.

Is this a serious economic issue? In fact, it’s a classic tale of how subsidies, use restrictions, and price controls can steer an economy in wrong directions. Car owners may not want to hear this, but we have way too much free parking.

Higher charges for parking spaces would limit our trips by car. That would cut emissions, alleviate congestion and, as a side effect, improve land use. Donald C. Shoup, professor of urban planning at the University of California, Los Angeles, has made this idea a cause, as presented in his 733-page book, “The High Cost of Free Parking.”

Many suburbanites take free parking for granted, whether it’s in the lot of a big-box store or at home in the driveway. Yet the presence of so many parking spaces is an artifact of regulation and serves as a powerful subsidy to cars and car trips. Legally mandated parking lowers the market price of parking spaces, often to zero. Zoning and development restrictions often require a large number of parking spaces attached to a store or a smaller number of spaces attached to a house or apartment block.