Loss Aversion: Capuchin Monkeys, Kahneman's Coffee Mugs and Loss Attention

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In one experiment, capuchin monkeys trained to trade silver tokens for food preferred a researcher who showed one piece of apple and handed it over to one who showed two pieces and then took one away, even though the outcome was identical. In 1979 Daniel Kahneman and Amos Tversky made this part of prospect theory, finding that losses feel roughly twice as painful as equal gains. In 1990 Kahneman, Jack Knetsch and Richard Thaler ran the coffee mug experiment, showing the endowment effect persisted even after they ruled out haggling and trading hassle with value tokens and random clearing prices.

Botond Kőszegi and Matthew Rabin extended the idea to expectations, so a sold-out jacket can feel like a loss. Roland Fryer and colleagues gave Chicago Heights teachers $8,000 up front that they would repay if scores did not improve, which raised test scores more than a traditional bonus. Brain scans show gains activating the ventral striatum and anticipated losses the amygdala, and a 2013 study found adolescents used extra brain regions to stay cautious. Then the twist: Eldad Yechiam and Guy Hochman argue the effect often vanishes with small stakes and propose loss attention instead.

• In one mug and Swiss chocolate variation, 86 percent of people given a mug kept it, while only 56 percent chose the mug when starting with nothing.
• Framing a $5 paper billing charge as a surcharge rather than a discount for going paperless changes behavior far more.
• Kahneman explained the evolutionary logic as organisms that treat threats as more urgent than opportunities surviving and reproducing.
• A 2011 Pope and Schweitzer study of PGA putts, including Tiger Woods, found golfers sink par putts more often than birdie putts from the same distance.
• The blemishing effect shows that mentioning a minor flaw alongside positives can make a product more attractive.