But the mere fact that Pigovian taxes produce greater benefits than costs doesn’t make them an easy sell politically. Like other changes in public policy, a Pigovian tax produces winners and losers. And it’s an iron law of politics that prospective losers lobby harder to block change than prospective winners do for its adoption. That asymmetry creates a powerful status-quo bias that makes even broadly beneficial policy changes hard to achieve.

Yet, in principle, any change that makes the economic pie larger makes it possible for everyone to enjoy a bigger slice than before. The practical challenge is to slice the larger pie so that everyone comes out ahead. A first step toward a vehicle-weight tax would be to make it revenue-neutral — for example, by returning its revenue in the form of lump-sum rebates to each buyer. That would soften the blow, while preserving the incentive to buy lighter vehicles.

For example, if the tax were 20 cents a pound, a 6,000-pound vehicle would be taxed at $1,200, as opposed to $800 for a 4,000-pound one. If an equal number of vehicles of each weight were sold, all buyers would get a $1,000 rebate when the total tax income was redistributed. The buyer in our example would thus be making a net payment of $200 because of the tax, but his total outlay would have been $400 lower if he’d bought the smaller vehicle instead.

Although revenue neutrality would help, buyers who really need large vehicles might feel aggrieved. Paradoxically, the key to mollifying them is to propose Pigovian taxes not just on vehicle weight but also on a swath of other activities that cause undue harm to others. We could tax drivers contributing to traffic congestion, for example, on the grounds that entering a crowded roadway causes delays to others. We could tax noise, carbon emissions and other specific forms of air and water pollution. Although some people would end up as losers under any single one of these measures, virtually everyone would come out ahead under a broad suite of Pigovian taxes.

That’s because adopting a large number of them is like repeated flips of a coin whose odds are stacked heavily in your favor. If someone offered a chance to flip a coin that paid $10 for heads and lost $1 for tails, would you take it? It’s an attractive gamble, obviously, but if there is only a single flip, there’s a 50 percent chance that you’ll be a loser. After many flips, however, you’d almost certainly be a net winner.