The Economist explains | The Economist explains economics

What is the Nash equilibrium and why does it matter?

Decisions that are good for individuals can sometimes be terrible for groups

By S.K.

This week “The Economist explains” is given over to economics. For each of six days until Saturday this blog will publish a short explainer on a seminal idea.

More from The Economist explains

What are the Russian “turtle tanks” seen in Ukraine?

Wrapping vehicles in corrugated metal might protect them from drone attacks

The tawdry history of “catch-and-kill” journalism

Testimony from Donald Trump’s trial highlights a practice that is normally hidden