Understanding Market Failure and Externalities
Market failure occurs when free markets fail to allocate goods and services efficiently. The three main culprits are externalities, public goods, and information gaps - all situations where the market price doesn't tell the full story.
Externalities are the spillover effects that hit third parties who weren't involved in the original transaction. Think of a factory polluting a river - the factory and its customers make their deal, but everyone downstream suffers the consequences. These effects create a gap between what individuals pay (private costs) and what society actually pays (social costs).
When negative externalities exist, social costs exceed private costs - like when your neighbour's loud music keeps you awake. With positive externalities, society benefits more than the individual - getting vaccinated protects everyone, not just you.
Key Insight: Externalities mess up market signals because the price doesn't reflect all the costs and benefits involved.
