The great theories of economics seem to have great explanatory power, but the actual world is often far too complicated and messy to fully test them out. Professor Ignacio Palacios-Huerta, an economist at the London School of Economics has an answer – sport. In the contained setting of competitive sport, he says, the rules are clear and you know who is doing what. This means, with some analysis, you can see vibrant illustrations of well-known economic theories playing out before your eyes. Ignacio talks to Tim Harford about some of his favourite economic theories, demonstrated in action in sporting competition.Presenter: Tim Harford Producer: Natasha Fernandes Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: John Scott Editor: Richard Vadon

Could the cut in winter fuel payments cost thousands of lives? Is it really true that criminals sentenced to three years will be out of prison in two months? Are older drivers more dangerous than young ones? Do Southeastern Railway shift 50 million leaves from their lines?Tim Harford investigates some of the numbers in the news.Presenter: Tim Harford Reporters: Bethan Ashmead Latham and Nathan Gower Producer: Natasha Fernandes Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: James Beard Editor: Richard Vadon

On the campaign trail for the US presidency, former president Donald Trump has been saying that the US is becoming a more dangerous than Venezuela.He also claims that the crime data for the US that the FBI collects is missing the most violent cities. Is he right? Tim Harford investigates, with the help of Bastian Herre from Our World in Data and Jay Albanese from Virginia Commonwealth University.Presenter: Tim Harford Producer: Bethan Ashmead Latham Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound Mix: Annie Gardiner Editor: Richard Vadon

Was an MP wrong about the number of people who pay capital gains tax?Why is 2% the magic number for the rate of inflation?Donald Trump says US crime figures are fake. Are they?How do you work out how many buffaloberries a bear eats in a day?And we fact-check a claim about the prevalence of suicide among GPs. For information and support follow this link: https://www.bbc.co.uk/actionlineTim Harford investigates some of the numbers in the news.Presenter: Tim Harford Reporters: Nathan Gower and Bethan Ashmead Latham Series Producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: Rod Farquhar Editor: Richard Vadon

The question of why some countries are rich and some poor has been described as the most important question in economics. Perhaps that is why the Royal Swedish Academy of Sciences awarded the Nobel Memorial Prize in Economics to Daron Acemoglu, Simon Johnson and James Robinson for their work on the importance of institutions in the economic fortunes of nation states. Tim Harford explains the economic theory that underpins their award.Presenter: Charlotte McDonald Reporter: Tim Harford Producer: Bethan Ashmead Latham Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: Giles Aspen Editor: Richard Vadon

Can we teach BBC political editor Chris Mason some new maths skills? Do 60 of the UK’s richest people pay 100% tax? Have water bills fallen in real terms since 2010? When it comes to HPV and cervical cancer, is zero a small number?Tim Harford investigates some of the numbers in the news.Presenter: Tim Harford Producers: Nathan Gower and Bethan Ashmead Latham Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: Sarah Hockley Editor: Richard Vadon

Professor Sir David Spiegelhalter is one of the great communicators of probability and uncertainty. His new book, The Art of Uncertainty, explains how to approach uncertainty, luck, probability and ignorance. Tim Harford talks to Sir David about double yoked eggs, the Bay of Pigs, and his top tips for politicians who want to communicate evidence and uncertainty. Presenter: Tim Harford Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: John Scott Editor: Richard Vadon

Are childhood obesity rates going down? Do 35 million birds die every year in the UK after hitting windows? How much money could the Chancellor find by changing the debt rule? And Professor Sir David Spiegelhalter contemplates the probability of his own conception.Tim Harford investigates some of the numbers in the news, and in life. Presenter: Tim Harford Reporter: Charlotte MacDonald Producers: Bethan Ashmead Latham, Natasha Fernandes and Nathan Gower Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: Neil Churchill Editor: Richard Vadon

National Geographic magazine recently wrote that “people in the United States eat more than 672 billion pounds of corn per year, which breaks down to more than 2,000 pounds per person annually”.Is this really true? Tim Harford investigates all the things that we don’t eat, that are counted in this number. Presenter: Tim Harford Producer: Bethan Ashmead Latham Production co-ordinator: Katie Morrison Sound mix: Giles Aspen Editor: Richard Vadon

Are GPs really working less hours per week? Does Wetherspoons really pay one in every £1000 of tax in the UK? Are more people in the UK economically inactive? How long does it take two rats to produce 17 octillion rats?Tim Harford investigates some of the numbers in the news.Presenter: Tim Harford Reporters: Natasha Fernandes and Bethan Ashmead-Latham Producer: Nathan Gower Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: Sarah Hockley Editor: Richard Vadon

Why do some puzzles make us immediately leap to the wrong conclusion?That’s the subject of Alex Bellos’ new book Think Twice, which has page after page of questions designed to deceive.Alex sets Tim Harford some of his favourite puzzles. Presenter: Tim Harford Series producer: Tom Colls Production co-ordinator: Katie Morrison and Janet Staples Sound mix: Donald MacDonald Editor: Richard Vadon

The government is encouraging pensioners to claim pension credit in order to remain eligible for winter fuel payments. Will people sign up - and might that end up costing the exchequer more than it saves?The Office for National Statistics has downgraded the status of a new statistic aiming to measure how many people are transgender. What went wrong?Cancer appears to be on the rise in people under 50. But are more people dying?And try your hand at a puzzle you’re likely to get wrong.Tim Harford investigates some of the numbers in the news.Presenter: Tim Harford Producers: Natasha Fernandes and Bethan Ashmead-Latham Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: Sarah Hockley Editor: Richard Vadon

We don’t usually do god on More or Less, but one listener got in touch to ask us to investigate a stat used by an Anglican priest on a BBC radio programme. Speaking on the “Thought for the Day” slot, Reverend Lucy Winkett said that around 85% of the world's population practice a religion. Is this true? We speak to Conrad Hackett, from the Pew Research Center, and the person whose research is the source for the claim.Presenter: Tim Harford Producer: Natasha Fernandes Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: Nigel Appleton Editor: Richard Vadon

Can we be sure that thousands of millionaires are leaving the UK? How much do asylum seekers cost the state? Who will win a geeky bet on private school pupil numbers? What does a string quartet teach us about the woes of the National Health Service?Tim Harford investigates some of the numbers in the news.Presenter: Tim Harford Producers: Caroline Bayley, Natasha Fernandes and Bethan Ashmead-Latham Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: Sarah Hockley Editor: Richard Vadon

Big stakes poker player and elections analyst Nate Silver is no stranger to a calculated risk. In his new book, On The Edge, he makes the case that people willing to take massive calculated risks are winning in the modern economy. Tim Harford talks to Nate about the mindset that’s driving hedge fund managers, crypto true-believers and silicon valley investors.Presenter: Tim Harford Producer: Beth Ashmead Latham Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: Nigel Appleton Editor: Richard Vadon

Do illegal migrants receive more in benefits than pensioners? Was Energy Secretary Ed Miliband right to celebrate a “record breaking” renewable energy auction? Is one divided by zero infinity? Why don’t we spend more on evidence that government spending works? And how long does it actually take to turn around an oil tanker?Tim Harford investigates some of the numbers in the news.Presenter: Tim Harford Reporter: Charlotte McDonald Producers: Natasha Fernandes, Bethan Ashmead-Latham and Nathan Gower Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: Gareth Jones Editor: Richard Vadon

Donald Trump wants new tariffs on goods coming into the US, describing them as a tax on other countries. The Democrats are no stranger to trade tariffs themselves, with Joe Biden having added them to numerous goods coming into the US from China.We talk to Erica York from the Tax Foundation about how tariffs work and who ends up paying for them.Presenter: Tim Harford Producers: Kate Lamble and Beth Ashmead Latham Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: Steve Greenwood Editor: Richard Vadon

Do half of children in Wales have special educational needs? Are permanent exclusions at the highest ever level in England? Labour are talking about a £22bn black hole. Is that a new black hole in the finances? Are there more Ghanaian nurses in the UK than in Ghana? Can you divide one by zero?Tim Harford looks at some of the numbers in the news.Presenter: Tim Harford Reporters: Kate Lamble and Nathan Gower Producer: Beth Ashmead Latham Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: Andy Fell Editor: Richard Vadon

The Cuban government has announced that their population has fallen by 10% in two years – just days after a demographer on the Caribbean island suggested an even bigger fall. But which is the right number, and why are so many people leaving? We speak to Dr Emily Morris from University College London and Dr Jorge Duany from the Cuban Research Institute at Florida International University.Presenter: Kate Lamble Producer: Beth Ashmead Latham Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: Sue Maillot Editor: Richard Vadon

The claim we all swallow 5.5 grams of microplastic each week – the same as the weight of a credit card – has been repeated by charities, newspapers and the World Economic Forum. But when you understand how this number was calculated, and the range of possible answers for the amount of plastic you eat, you might not want to repeat it yourself. Professor Jamie Woodward from the University of Manchester explains what’s what. Presenter: Kate Lamble Producer: Beth Ashmead Latham Researcher: Ajai Singh Series producer: Tom Colls Production co-ordinator: Katie Morrison Sound mix: Giles Aspen Editor: Richard Vadon

Recent reports claimed the average global mark-up, the difference between the price of production and the price that product is sold for, rose from 7% in 1980 to 59% by 2020.So is this true? Are some companies choosing to charge us more than ever for their products?We investigate the accuracy of these claims, and which companies are responsible with the help of Jan Eeckhout a Professor of Economics at Pompeu Fabra University in BarcelonaPresenter: Kate Lamble Producer: Beth Ashmead Latham Production co-ordinator: Katie Morrison Sound mix: Neil Churchill Editor: Richard Vadon

Canadian psychologist and culture war commentator Jordan Peterson says planet Earth has got 20% greener in the last 20 years. But satellite data tells a different story. We investigate the correct number, with the help of Dr Chi Chen, from Rutgers University in the US.Presenter: Kate Lamble Series producer: Tom Colls Production co-ordinator: Brenda Brown Sound mix: Giles Aspen Editor: Richard Fenton-Smith

Researchers have catalogued 7,164 languages spoken around the world - some are used daily by billions. Half are spoken by less than 8000 people. The death of a language, when it’s no longer spoken as a first language by anyone living is a deeply significant moment in the cultural life of communities. Multiple sources including the UN and National Geographic magazine have claimed this happens every two weeks. But we have reasons to be suspicious about that statistic. Gary Simons, executive editor of the Ethnologue language catalogue, explains where this idea came from.Presenter: Kate Lamble Producer: Natasha Fernandes Series producer: Tom Colls Production co-ordinator: Brenda Brown Sound mix: Nigel Appleton Editor: Richard Fenton-Smith

The idea that women outnumber men by 14 to 1 as casualties of natural disasters has been repeated in newspapers and online for years - the UN have even used this statistic.But when you track down the source, the research behind this claim leaves much to be desired.Presenter: Kate Lamble Series producer: Tom Colls Production co-ordinator: Brenda Brown Sound mix: Nigel Appleton Editor: Richard Fenton-Smith

Is climate change making turbulence more dangerous for people taking flights around the world? That’s what one listener asked, following a terrifying turbulence incident which left one person dead and more than 20 injured on a flight to Singapore.We speak to turbulence expert Paul Williams, Professor of Atmospheric Science at the University of Reading, to understand what is going on.Presenter: Kate Lamble Producer: Nathan Gower Series producer: Tom Colls Production co-ordinator: Brenda Brown Sound mix: Nigel Appleton Editor: Richard Vadon

How can tennis star Roger Federer have won only 54% of the points he played, but been the best player in the world? Jeff Sackmann, the tennis stats brain behind tennisabstract.com, explains to Tim Harford how probability works in the sport.Presenter: Tim Harford Producer: Debbie Richford Series producer: Tom Colls Production co-ordinator: Brenda Brown Sound Mix: Nigel Appleton Editor: Richard Vadon

You might have found it boring in school maths classes, but Matt Parker thinks we should all learn to love trigonometry. The ‘Love Triangle’ author talks to Tim Harford about the maths used in GPS, architecture and special effects. Presenter: Tim Harford Producer: Debbie Richford Series Producer: Tom Colls Production Co-ordinator: Brenda Brown Sound Mix: Nigel Appleton Editor: Richard Vadon

Are Labour right about employment? Are the Conservatives right about cutting NHS managers? Are the Lib Dems right about share buyback? Are Reform UK right about their tax plans? How do they make the exit poll so accurate? What are the odds of meeting a very tall man in finance (with a trust fund)? What does it mean that Roger Federer only won 54% of the points he played? Tim Harford investigates some of the numbers in the news. Presenter: Tim Harford Reporter: Kate Lamble Producers: Nathan Gower, Beth Ashmead Latham and Debbie Richford Series producer: Tom Colls Production coordinator: Brenda Brown Sound mix: Rod Farquhar Editor: Richard Vadon

he US has been portrayed as in the grip of a maternal mortality crisis. In contrast to most other developed nations, the rate of maternal deaths in the US has been going up since the early 2000s. But why? With the help of Saloni Dattani, a researcher at Our World in Data, Tim Harford explores how a gradual change in the way the data was gathered lies at the heart of the problem. Presenter: Tim Harford Producer: Debbie Richford Production Co-ordinator: Brenda Brown Series Producer: Tom Colls Sound Mix: Emma Harth Editor: Richard Vadon

Are Labour right about the Liz Truss effect on mortgages? Are the Conservatives right about pensioners? Are Plaid Cymru right about spending? Are the Lib Dems right about care funding? Is Count Binface right about croissants?Why are MRP polls coming up with such different numbers?Do erections require a litre of blood?Tim Harford investigates the numbers in the news.Presenter: Tim Harford Reporter: Kate Lamble Producers: Simon Tulett, Nathan Gower, Beth Ashmead Latham and Debbie Richford Series producer: Tom Colls Production coordinator: Brenda Brown Sound mix: Rod Farquhar Editor: Richard Vadon

So-called “pig butchering” scams take billions of dollars from people around the globe. But do the cyber scams run from compounds in Cambodia really take an amount of money equivalent to half that country’s GDP? We investigate how the scale of these criminal operations has been calculated. Presenter: Tim Harford Reporter: Tom Colls Production coordinator: Brenda Brown Sound mix: Andrew Garratt Editor: Richard Vadon

Will Conservative policies raise mortgages by £4800, as Labour claim? Are primary school kids in England the best readers in the (western) world, as the Conservatives claim? Are there more potholes in the UK than craters on the moon? Tim Harford investigates some of the numbers in the news. Presenter: Tim Harford Reporter: Kate Lamble Producers: Nathan Gower, Simon Tullet Beth Ashmead-Latham and Debbie Richford Production coordinator: Brenda Brown Sound mix: James Beard Editor: Richard Vadon

AWilliam Shakespeare might well rank as the most influential writer in the English language. But it seems he also had a knack for numbers. Rob Eastaway, author of Much Ado about Numbers, tells Tim Harford about the simple maths that brings Shakespeare’s work to life. Presenter: Tim Harford Readings: Stella Harford and Jordan Dunbar Producer: Beth Ashmead-Latham Series producer: Tom Colls Production coordinator: Brenda Brown Sound mix: James Beard Editor: Richard Vadon

What’s going on with the dodgy bar charts that political parties put on constituency campaign leaflets?What’s the truth about tax promises?Are 100,000 oil workers going to lose their jobs in Scotland?Will class sizes increase in state schools if private schools increase their fees?Tim Harford investigates some of the numbers in the news.Presenter: Tim Harford Reporter: Kate Lamble Producers: Nathan Gower, Beth Ashmead-Latham, Debbie Richford Production coordinator: Brenda Brown Sound mix: Neil Churchill Editor: Richard Vadon

The claim that medical error is the third leading cause of death in the US has been zooming around the internet for years. This would mean that only heart disease and cancer killed more people than the very people trying to treat these diseases. But there are good reasons to be suspicious about the claim.Professor Mary Dixon-Woods, director of The Healthcare Improvement Studies Institute, or THIS Institute, at Cambridge University, explains what’s going on.Presenter: Tim Harford Series producer: Tom Colls Production coordinator: Brenda Brown Sound mix: Nigel Appleton Editor: Richard Vadon

Were there any suspicious claims in the election debate between Rishi Sunak and Keir Starmer?Do the claims in Reform UK’s policy documents on excess deaths and climate change make sense?Can the Conservatives and Labour raise £6bn a year by cracking down on tax avoidance and evasion?And do all the humans on earth weigh more than all of the ants?Presenter: Tim Harford Reporters: Kate Lamble and Nathan Gower Producer: Beth Ashmead-Latham Series producer: Tom Colls Production coordinator: Brenda Brown Editor: Richard Vadon

India’s election has been running since 19 April. With results imminent on 4th June, More or Less talks with Chennai based data communicator Rukmini S. She founded Data for India, a new website designed to make socioeconomic data on India easier to find and understand. She talks us through the changing trends to help give a better picture of the type of country the winning party will govern.Producers: Bethan Ashmead and Nathan Gower Sound Engineer: Nigel Appleton Production Coordinator: Brenda Brown Editor: Richard Vadon

Prime Minister Rishi Sunak has said that the UK economy is growing faster than Germany, France and the US, while Labour says the typical household in the UK is worse off by £5,883 since 2019. Are these claims fair? We give some needed context. Net migration has fallen - we talk to someone who predicted it would - Dr Madeleine Sumption, director of the Migration Observatory at the University of Oxford. Is Taylor Swift about to add £1 bn to the British economy as some media outlets have claimed? The answer is ‘No’. Why are our prisons full? We ask Cassia Rowland from the Institute for Government. Presenter: Tim Harford Producers: Charlotte McDonald, Nathan Gower, Bethan Ashmead Latham and Ellie House Series producer: Tom Colls Sound mix: Neil Churchill Production coordinator: Brenda Brown Editor: Richard Vadon

News stories earlier in the year appeared to suggest that time restricted eating – where you consume all your meals in an 8 hour time window – was associated with a 91% increase in the risk of death from cardiovascular disease. But is this true? Tim Harford looks into the claim with the help of Cardiologist Dr Donald Lloyd-Jones, chair of the Department of Preventive Medicine at Northwestern University in the US.Presenter: Tim Harford Producer: Debbie Richford Series producer: Tom Colls Production coordinator: Brenda Brown Sound mix: Nigel Appleton Editor: Richard Vadon

Is it going to take 685 years to clear NHS waiting lists in England?Are 10 per cent of MPs under investigation for sexual misconduct?How does gold effect the UKs export figures?What does it mean to say that a woman has 120% chance of getting pregnant?Tim Harford investigates some of the numbers in the news.Presenter: Tim Harford Producers: Nathan Gower and Bethan Ashmead Latham Series producer: Tom Colls Sound mix: Neil Churchill Production coordinator: Brenda Brown Editor: Richard Vadon

It’s long been known that marriage is associated with happiness in survey data. But are falling marriage rates in the US dragging down the mood of the whole nation? We investigate the statistical relationships with Professor Sam Peltzman from the University of Chicago, and Professor John Helliwell, from the University of British Columbia.Presenter: Tom Colls Reporter: Natasha Fernandes Production co-ordinator: Brenda Brown Sound mix: Nigel Appleton Editor: Richard Vadon

If a child loves reading, how big a difference does that make to their future success? In a much-repeated claim, often sourced to a 2002 OECD report, it is suggested that it makes the biggest difference there is – that reading for pleasure is the biggest factor in future success. But is that true? We speak to Miyako Ikeda from the OECD and Professor Alice Sullivan from University College London.Presenter / series producer: Tom Colls Reporter / producer: Debbie Richford Production co-ordinator: Brenda Brown Sound mix: Graham Puddifoot Editor: Richard Vadon

Polling by YouGov made headlines around the world when it suggested 20% of young adults in the US thought the holocaust was a myth.But polling experts at the Pew Research Centre thought the result might not be accurate, due to problems with the kind of opt-in polling it was based on. They tried to replicate the finding, and did not get the same answer.We speak to Andrew Mercer from the Pew Research Centre and YouGov chief scientist Douglas Rivers.Presenter /series producer: Tom Colls Production co-ordinator: Brenda Brown Sound Mix: Graham Puddifoot Editor: Richard Vadon

Libertarian populist Javier Milei won the presidential election in Argentina on a promise austerity and economic “shock” measures for the ailing economy. Just a few months in, some are hailing the falling rate of inflation as showing those measures are working. Economist Monica de Bolle, senior fellow at the Peterson Institute for International Economics, explains whether that thinking is correct. Presenter/producer: Tom Colls Producer: Ajai Singh Production co-ordinator: Brenda Brown Sound mix: Graham Puddifoot Editor: Richard Vadon.

The Cass Review is an independent report on the state of gender identity services for under-18s in England’s NHS.It found children had been let down by a lack of research and "remarkably weak" evidence on medical interventions in gender care.But before it was even released, claims were circulating online that it ignored 98% of the evidence in reaching its conclusion. Is that claim true?We speak to Dr Hilary Cass, the author of the review, Professor Catherine Hewitt of York University, who analysed the scientific research, and Kamran Abbasi, editor in chief of the British Medical Journal.Presenter: Kate Lamble Producer: Tom Colls Production co-ordinator: Brenda Brown Sound Mix: James Beard Editor: Richard Vadon

Netflix has a big new show named after and inspired by a classic problem in astrophysics, 'The Three Body Problem', where predicting the course and orbits of three or more celestial bodies proves near impossible.But how faithful is the Netflix show - and original novel - to the actual physics? Dr Anna Lisa Varri from the University of Edinburgh explains what we can and can't say about the complex and beautiful motions of planets, stars and moons, and brings a dose of scientific facts to science fiction.Presenter: Kate Lamble Producer: Nathan Gower Sound Engineer: Graham Puddifoot Editor: Richard Vadon

Is loneliness as bad for you as smoking 15 cigarettes per day? That’s the claim circulating on social media.We trace this stat back to its source and speak the scientist behind the original research on which it is based, Professor Julianne Holt-Lunstad.Presenter / series producer: Tom Colls Reporter: Perisha Kudhail Production co-ordinator: Brenda Brown Sound Mix: Graham Puddifoot Editor: Richard Vadon

Daniel Kahneman, a Nobel prize-winning behavioural economist and More or Less hero, has died at the age of 90. Tim Harford explains his ideas and influence. Presenter: Charlotte McDonald Series producer: Tom Colls Sound mix: Hal Haines Production co-ordinator: Brenda Brown Editor: Richard Vadon