Why Egg Prices Are So Volatile

Few staple foods move as violently as eggs. A carton that costs a couple of dollars for months can double within weeks and then fall back almost as fast. Bread, milk and rice rarely behave this way. Understanding why eggs are different comes down to how they are produced: from a single biological input — the laying hen — with very little storage to cushion a shock, and with a feed bill that tracks global grain markets in near real time.

The single largest driver of egg-price spikes is avian influenza. When a highly pathogenic strain reaches a commercial flock, the standard response is to cull every bird on the farm to stop the spread. A single large operation can house millions of hens, so one outbreak can remove a meaningful slice of a country's laying capacity in days. Supply drops immediately, but it cannot recover immediately: a new hen has to be raised to laying age, a process of months, not hours.

That asymmetry — instant loss, slow replacement — is what makes bird-flu shocks so sharp. Prices jump the moment supply tightens and stay elevated until flocks are rebuilt. The United States has lived through repeated episodes of exactly this pattern, which is why its price line can look calm for long stretches and then lurch upward. The companion article on bird flu traces that mechanism in more detail.

The second force is the feed bill. Corn and soybean meal make up the majority of what it costs to keep a laying hen, and both are globally traded commodities whose prices swing with harvests, energy costs and geopolitics. When grain markets spiked after the 2022 disruption to Black Sea exports, egg producers everywhere saw their costs rise at once, and retail prices followed.

Because feed is such a large share of the total, egg prices are unusually sensitive to it. A modest move in corn or soy passes through to the shelf more directly than it would for foods where processing, packaging and branding dominate the cost. This is also why egg prices in different countries can rise together even without a shared disease outbreak — they are all buying from the same global grain market.

Many commodities absorb shocks through storage. Grain sits in silos; frozen meat waits in warehouses. Eggs have almost none of this cushion. They are perishable, sold fresh, and produced on a continuous cycle that cannot easily be sped up or slowed down. When demand rises before a holiday or supply falls after an outbreak, there is no large reserve to draw down, so the adjustment happens through price instead.

Production is also relatively concentrated in many markets, with a handful of large operations supplying much of the volume. That efficiency keeps ordinary prices low, but it means a problem at a few big farms — or a policy change affecting them — moves the national price more than it would in a fragmented industry.

Put together, these forces explain the characteristic egg-price pattern: long quiet periods punctuated by sudden spikes. The quiet comes from efficient, low-cost production. The spikes come from disease and feed shocks hitting a system with little slack. When you see a national egg price climb quickly, it is usually one of these two causes; when it falls back, it is flocks rebuilding or feed costs easing.

Where enough daily history has accumulated, the chart above shows this texture directly for the United States. Elsewhere on the site, a country's page begins tracking its own line as soon as the crawlers have gathered enough real observations — no synthetic history is ever drawn in to fill the gap.