How We Measure Egg Prices Across 151 Countries

A number like "the price of eggs in country X" hides a surprising amount of judgment. Which eggs — a pack of six, ten, a dozen? Whose price — a discount supermarket, a corner shop, a government statistic? In which currency, and converted how? Get any of these wrong and a cross-country comparison becomes meaningless. This article lays out the choices behind the index so that the rankings elsewhere on the site can be read with the right amount of trust.

The first rule is the strictest: the site shows only genuinely observed prices. That means official government or intergovernmental statistics and live scrapes of real retailers — the actual price on a real shelf or in a real dataset. It does not show hand-set estimates, crowd-sourced guesses, or feeds that have stopped updating. A country appears only when it has a real, recent price behind it; if the data goes stale past a generous cutoff, the country drops out rather than display a number nobody can stand behind.

This is a deliberate trade-off. Refusing estimates means some countries are missing that a less careful index would happily list. The judgment is that an honest gap is better than a confident fabrication — a principle that shapes every other decision below.

Many countries have more than one possible price, so the index ranks its sources. National or bloc-level official statistics come first — a government's own consumer-price series is the most authoritative reading of what shoppers pay. Next come live retail scrapes: the real shelf price at a major grocer, specific to that country. Below those sits the FAO's cross-country monitoring, and last a market-price aggregator used only where nothing better exists for a major economy. Each country's headline is the best single source available to it, not an average across incompatible ones.

There is one important distinction inside that ladder. Official statistics and supermarket scrapes are retail prices — what a consumer actually pays. The fallback sources are closer to market or wholesale prices, which typically run substantially cheaper. Because mixing the two would inflate the apparent spread, the site keeps them in separate tiers and ranks and compares only within a tier wherever it can.

Eggs are sold in different pack sizes everywhere, so every price is normalized to a common basis — ten eggs — before anything is compared. A price for a dozen or a tray is converted to the per-ten figure so that Seoul and São Paulo are measured with the same ruler.

Currency is the harder problem. Prices are converted to US dollars using daily exchange rates, but some currencies have distorted or multiple official rates where the official conversion produces nonsense. For those, the index trusts only sources whose price is already denominated in dollars, rather than converting a local price through a misleading rate. A sanity band also discards obviously broken values — a scrape that reports an egg costing thousands of dollars is dropped, not published.

The site never draws a price history it did not observe. A country's trend chart appears only once enough real daily data points have accumulated for it; until then, there is no chart at all, rather than a smooth line invented to look complete. The window simply grows as the crawlers run. The same honesty governs timestamps: each figure carries the date it was actually observed, and government data that lags by weeks is labeled as such rather than passed off as today's price.

None of this makes the index perfect — no global price comparison can be. But every choice here points the same way: toward showing what is real and admitting what is not. That is the standard the rankings and articles across the site are built on.