Freakonomics Rev Ed

The commission math is damning. On a $300,000 home, a typical 6% commission yields $18,000 — but after the buyer's agent and the agency each take their cut, your agent pockets just 1.5%, or $4,500. If she could sell your home for $310,000, you'd gain an extra $9,400 — but she'd gain only $150. That's not enough incentive to hold out for a better deal.

Data from nearly 100,000 Chicago home sales confirms the conflict. Agents keep their own homes on the market an average of 10 extra days and sell them for over 3% more — roughly $10,000 on a $300,000 house. Even their ad language shifts: selling your house, agents use vague terms like "charming" (code for old); selling their own, they emphasize specifics like "granite" and "maple."

The KKK's power came from secrecy. In the 1940s, activist Stetson Kennedy obtained inside information about the Klan — its passwords, rituals, and ridiculous hierarchy (the "Chief Ass Tearer," the "Kloran") — largely through an infiltrator named John Brown. Kennedy fed these secrets to the Superman radio show and journalist Drew Pearson, turning the Klan's mystique into a national joke. Membership and attendance dropped.

The same principle toppled commercial experts. Economists call it information asymmetry — one party knowing far more than the other. It's what gives funeral directors, car dealers, and insurance companies their edge. When comparison websites for term life insurance launched in 1996, consumers could suddenly see competing prices side by side. Premiums dropped by $1 billion per year almost overnight. Secrecy is fragile; transparency is lethal.

Chicago's teacher-cheating algorithm analyzed 100 million test answers across 700,000+ students. It flagged classrooms where blocks of identical correct answers appeared among struggling students — especially on hard, late-exam questions — followed by dramatic score drops the next year. About 200 cheating classrooms (~5%) were identified annually. When suspected rooms were retested under independent supervision, scores plunged a full grade level. A dozen teachers were fired, and cheating fell over 30%.

Sumo wrestling told the same story. Among 32,000 bouts, wrestlers needing one more win (7-7 record) beat opponents with nothing at stake (8-6 record) nearly 80% of the time — far above the expected 50%. In rematches, that figure dropped to 40%, suggesting quid pro quo deals across the sport.

The book's most provocative claim. Every criminologist predicted crime would surge in the 1990s. Instead, it plummeted. The commonly credited explanations were mostly wrong: the economy has virtually no link to violent crime; NYC's policing strategies coincided with a 45% expansion of its police force, and accounting for that hiring, NYC's drop was merely average; gun buybacks prevented less than one-tenth of one homicide per program.

The real cause was 20 years old. After Roe v. Wade (1973), millions of women — disproportionately poor, unmarried, and teenage — chose not to carry unwanted pregnancies to term. Their unborn children would have entered crime-prone years in the early 1990s. The five states that legalized abortion before Roe saw crime decline earlier. States with the highest 1970s abortion rates experienced the greatest 1990s crime drops.

Sociologist Sudhir Venkatesh spent six years embedded with a Chicago crack gang and obtained four years of its financial ledgers. The gang operated like a franchise: a local leader (J.T.) paid roughly 20% of revenues to a "board of directors" for exclusive selling territory. J.T. earned ~$100,000/year. His three officers made about $7/hour. Street-level foot soldiers earned $3.30/hour — below minimum wage. Most held legitimate side jobs.

The economics mirror a tournament. Just as aspiring actors endure waitressing for a shot at stardom, foot soldiers accepted terrible pay and a 1-in-4 chance of being killed over four years — worse odds than Texas death row — for the slim hope of climbing the pyramid. The top 120 leaders (2.2% of membership) captured more than half the gang's total income.

Parents routinely ban playdates at homes with guns while sending children to homes with pools. The data says this is backward. There is one child drowning per 11,000 residential pools (~550 under-ten deaths per year) versus one child killed by a gun per 1 million-plus guns (~175 deaths). Yet a gun death is dramatic and horrifying; a drowning is quiet and familiar.

Risk consultant Peter Sandman distills the problem: Risk = hazard + outrage. When outrage is high but hazard low, we overreact (mad-cow disease, terrorism). When hazard is high but outrage low, we underreact (pools, kitchen pathogens). The same logic explains why we fear flying more than driving despite roughly equal per-hour death rates. Experts exploit this gap — fear is a short-term play in a world impatient with long-term processes.

The Early Childhood Longitudinal Study (ECLS) tracked 20,000+ children from kindergarten through fifth grade. Eight factors correlated with strong test scores:
1. Highly educated parents
2. High socioeconomic status
3. Mother 30+ at first birth
4. English spoken at home
5. Parents in the PTA
6. Many books in the home
7. Child not adopted
8. Child not low birthweight

Eight factors showed no correlation: intact family, move to a better neighborhood, stay-at-home mom, Head Start, museum visits, spanking, TV watching, and being read to daily.

The pattern is stark. Factors that matter describe who parents are — education, age, economic standing. Factors that don't matter describe what parents do — museum trips, bedtime stories, TV rationing. Technique, it turns out, is highly overrated compared to the identity you've already built.

Winner Lane racked up three dozen arrests. His brother Loser became a police detective and sergeant. Their father named them to test whether names shape destiny. The data's answer: they don't.

California birth-certificate data spanning 16 million births shows that people with distinctively black names — DeShawn, Imani — do have worse average life outcomes than those named Jake or Molly. But controlling for neighborhood and family circumstances, the gap vanishes. DeShawn's name doesn't cause disadvantage; it reflects the socioeconomic conditions of parents who choose it. The same logic explains why children surrounded by books test better — not because books are magic, but because parents who buy them tend to be educated. Confusing indicators with causes is one of the most common errors in everyday reasoning.