Why 'Don't You Understand Economics?' Is a Con

An 18-minute video essay, uploaded on 18 October 2026, by Barry Ferns. In British debate, “basic economics” and “economics 101” get used to end a conversation. His point is that the field’s own prizewinners overturned exactly the parts most often quoted: wages, behaviour and tax. A physics 101 diagram survives being checked, he says, and an economics 101 diagram often doesn’t.

On wages, Card and Krueger (1994) compared New Jersey, which raised its minimum wage from $4.25 to $5.05 in April 1992, with Pennsylvania next door, which didn’t. Fast-food employment did not fall. The profession was hostile. James Buchanan wrote in the Wall Street Journal in 1996 that economists had “not yet become a bevy of camp-following whores”. Card later said the paper cost him a lot of friends and he moved on from the topic. He shared the Nobel in 2021.

On behaviour, homo economicus meets Kahneman and Tversky’s prospect theory (1979): losses weigh roughly twice as much as gains, people anchor on reference prices, and they pay to avoid uncertainty, which explains phone insurance and fixed-rate mortgages. Kahneman won the Nobel in 2002 and Thaler in 2017. Then the crash. The Queen asked at the LSE in November 2008 why nobody had seen it coming, and the British Academy’s letter of July 2009 blamed “a failure of the collective imagination of many bright people”. Ferns contrasts engineering: London’s Millennium Bridge wobbled the week it opened in June 2000, closed, was fitted with dampers (about ninety) and reopened in 2002, problem fixed.

He keeps the economics that holds up: build no houses and rents rise, print money and prices rise. On tax he cites two studies. Young and colleagues (2016) followed 45 million tax records over 13 years and found millionaires move state about 2.4% a year, less than everyone else, with tax explaining little of it. Advani, Burgherr and Summers (2023) found that the UK’s 2017 non-dom reform pushed fewer than one in twenty of those affected to leave. His conclusion is that “econ 101” in an argument is a memory of a textbook from before the corrections, and the honest position is knowing what you don’t know.