Freakonomics: 8 key ideas
The core ideas of Freakonomics, each in under a minute, written in our own words. Want the full depth? Get the book.
- IDEA 1 OF 8
Incentives explain much of behaviour
Levitt and Dubner argue that incentives, whether money, social approval or moral feelings, are the key to understanding why people act as they do.
Once you know what someone stands to gain or lose, surprising behaviour often starts to make sense.
- IDEA 2 OF 8
Even trusted people cheat
Using test data from Chicago schools, the authors show that some teachers changed students' answers when their pay or jobs depended on scores.
They also find signs that sumo wrestlers sometimes fixed matches when one wrestler badly needed a win.
- IDEA 3 OF 8
Experts can exploit what they know
Estate agents know far more about the housing market than their clients.
The authors find that agents tended to keep their own houses on the market longer and sell them for more, suggesting they did not always push hard for clients.
- IDEA 4 OF 8
Most drug dealers earn very little
Drawing on a researcher's records of a Chicago gang, the authors show that the gang worked like a company.
A few leaders earned well, while most street dealers earned less than minimum wage, which is why many still lived with their mothers.
- IDEA 5 OF 8
Big causes can be hidden
The authors controversially argue that the legalisation of abortion in the United States in the 1970s contributed to the fall in crime in the 1990s.
They suggest that fewer unwanted children grew up in difficult circumstances, though this claim has been debated.
- IDEA 6 OF 8
Conventional wisdom is often wrong
Levitt and Dubner encourage readers to question widely accepted beliefs.
They show that commonly cited explanations, such as clever policing alone causing crime to fall, may matter less than people think.
- IDEA 7 OF 8
Parenting choices matter less than expected
Looking at data on children's school results, the authors suggest that who parents are, such as their education, matters more than many specific things they do.
This challenges the idea that small parenting techniques decide a child's success.
- IDEA 8 OF 8
Names reveal social patterns
The authors study how parents choose names and find that names often move from wealthier families to poorer ones over time.
Names reflect parents' hopes and backgrounds, but the authors argue that a name itself does not determine a child's future.
Get one idea like this every daySwipe through ideas, go deeper on any of them, and save the ones that matter. Free.
Read Freakonomics in the app