According to the article, why does the free-rider problem get worse as groups get larger?

Social pressure that works in small groups breaks down at scale

Larger groups have less money to contribute

Social pressure that works in small groups breaks down at scale

Governments are less efficient at managing large populations

Public goods become rivalrous when too many people use them

💡 Why your neighbor won't chip in for the streetlight — and why that breaks markets

Markets are brilliant at pricing sneakers and lattes, but they completely fall apart when it comes to things like streetlights, national defense, or clean air. These are public goods — things that are non-excludable (you can't stop someone from benefiting) and non-rivalrous (one person using it doesn't reduce it for others). And they create one of the most stubborn problems in economics.

The issue is the free-rider problem. If your street needs a new light, every household benefits whether they pay or not. So the rational move? Let your neighbors pay and enjoy the light for free. But when everyone thinks this way, nobody pays, and the streetlight never gets built. The market, left alone, underproduces public goods because there's no way to charge people based on how much they actually value them.

This is why governments step in — funding public goods through taxation rather than voluntary payment. But it's not a clean fix. Economist Mancur Olson showed that the free-rider problem gets worse as groups get larger. In a village of 10, social pressure might work. In a city of 10 million, it won't. This insight explains why international challenges like climate action are so hard: the benefits are shared globally, but the costs are borne locally. Every country has an incentive to let others bear the burden — a planetary-scale free-rider problem with no world government to solve it.