Why do most prices rarely change?

Dialogues économiques

Fuel prices are almost constantly changing, whilst prices paid for electrical appliances may remain stable for several months. For most products, prices tend to remain the same over weeks or even months. There is a simple explanation for this: it would be too expensive for companies to perpetually analyse market price changes. This is the conclusion reached by economists Mark N. Harris, Hervé Le Bihan and Patrick Sevestre after analysing the evolution of prices of several hundred industrial product pricess.

September 15th 2021

Previously issued

Dialogues économiques

When economic precarity compounds the harms of homophobia

In many low- and middle-income countries, being LGBTQIA+ entails a double burden: discrimination compounded by economic precarity. Economists Bruno Ventelou and Erik Lamontagne reveal how this combination can undermine mental health, by cross-referencing global data on wellbeing, economic conditions, and the homophobic climate.

January 09th 2026

Press

In Spain, economic policy has been conducive and has benefited from favourable circumstances

Only in French - An op-ed by Cecilia García Peñalosa (CNRS, EHESS, AMSE) and Alain Trannoy (EHESS, AMSE) published in the newspaper Le Monde.

December 22nd 2025

Dialogues économiques

The True Price of CO₂

In 2024, a grim record was set: it was the hottest year ever recorded on Earth. The signs of climate upheaval are now visible to all, as global warming manifests itself in a rapid rise in extreme weather events. In theory, the solution is straightforward: we must stop burning fossil fuels. In practice, phasing out energy sources so firmly entrenched in contemporary societies is an immense challenge. To reduce CO₂ emissions, economists — trained in cost–benefit analysis — can help policymakers design strategies that are both effective and socially acceptable.

December 10th 2025