Why Eggs? The Anatomy of America's Most Volatile Grocery Price

We've written before about the grocery aisle's defining physics: prices step up during an inflationary burst and almost never step back down. Wages, rent, processing, transport — the costs underneath most food prices are sticky, so the register total ratchets one way.

Eggs break the rule. Egg prices don't ratchet; they whipsaw. A carton that cost around two dollars can pass six dollars a year later and be back under five a few months after that. This has now happened twice in a decade — dramatically in 2022–23 and again in 2024–25 — which makes eggs the best case study in American food retail for a different kind of price behavior entirely: the supply shock. Understanding why eggs spike (and why, unlike nearly everything else, they actually come back down) means understanding a supply chain that is uniquely fast on the demand side and uniquely slow on the supply side.

The shock: one virus, entire barns

The proximate cause of both recent egg crises is highly pathogenic avian influenza, or HPAI — a bird flu that has circulated in wild birds and spilled into poultry flocks repeatedly since early 2022. Per the Congressional Research Service, from the outbreak's start in February 2022 through May 2025, about 173 million U.S. birds were affected across 1,704 flocks — and table-egg-laying hens took roughly three-quarters of the total commercial poultry loss.

That concentration in layers is not bad luck; it's structure. American egg production is industrially consolidated: a single complex can house millions of hens in adjacent barns. And federal policy for HPAI is "stamping out" — when the virus is confirmed in a flock, the entire flock is depopulated to stop spread, with USDA paying indemnities for the birds destroyed. The policy logic is straightforward (HPAI is close to 100% lethal in poultry and moves fast), but the arithmetic is brutal: one positive test at one large complex can subtract several million layers from national supply in a week. The 2022 wave took out more than 43 million layers, per USDA's Economic Research Service; the wave from mid-October 2024 through early March 2025 depopulated another 50.7 million.

Two waves through the henhouse

Birds lost to HPAI and depopulation, millions

For scale: the national table-egg flock normally runs a bit over 300 million hens, and CRS notes the average flock was 5.3% smaller in 2024 than in 2021. Losing 50 million layers in a few months is not a rounding error; it's a double-digit hole in the country's daily egg output.

Why supply can't rush back

Here's where biology sets the clock. An egg farm can't restock like a warehouse. After a barn is depopulated, it must be cleaned and cleared for repopulation — and then the replacement birds have to grow. A chick doesn't lay her first egg until she's matured through the pullet stage, a process measured in months, not weeks. Multiply that across tens of millions of birds — with hatchery capacity, pullet-raising space, and biosecurity constraints all binding at once — and national supply takes quarters, not days, to heal. USDA's own inventory data captured the depth of the 2022 hole: egg stocks ended that year 29% lower than they began it.

Meanwhile, the usual pressure valves barely work:

• Storage can't smooth it. Shell eggs are perishable and legally date-limited; there's no strategic egg reserve, no grain-elevator equivalent buffering months of supply.
• Imports can't fill it. Shell eggs are fragile, heavy, and subject to strict food-safety equivalence rules, so international trade in table eggs is thin. When U.S. supply drops, the world can't easily ship the gap.
• Substitution is weak. Eggs are a baking input and breakfast staple with no close substitute at the price point. Economists call demand like this inelastic: when prices double, purchases fall only modestly. Households grumble and pay.

It helps to appreciate what a modern layer actually is: a highly optimized biological machine that produces roughly an egg a day at her peak, beginning around five to six months of age and tapering over the following year or two. The national flock is, in effect, a conveyor belt of overlapping generations — chicks entering one end, spent hens leaving the other — sized so that daily output matches daily consumption almost exactly. There is no slack by design, because slack is expensive: every hen eats whether or not her eggs are needed. A system engineered for zero surplus is a system with nothing to give when 15% of the belt disappears in a season.

Inelastic demand meeting a hard supply constraint produces exactly what the textbooks predict: small quantity shortfalls, huge price moves. That's the entire secret of egg volatility, and it's why eggs behave more like airline seats — a perishable product whose price is doing real-time rationing — than like the shelf-stable goods around them.

The whiplash, on the record

Both legs of the cycle are unusually well documented, because wholesale and retail prices are tracked separately and they tell the story in stereo.

On the way up: as the winter 2024–25 wave destroyed flocks into the holiday baking season, the benchmark wholesale price hit an all-time high of $8.20 per dozen in February 2025, per USDA ERS. Retail followed to its own record — $6.23 per dozen in March 2025, per the BLS average-price data cited by CRS.

On the way down: with the outbreak pausing and demand ebbing after the holidays, wholesale collapsed to $3.74 by April 2025 — a 54% drop in two months — while retail drifted down to $5.12 in April and $4.55 in May.

Wholesale crashes fast; retail follows slowly

U.S. egg prices, dollars per dozen, 2025

Notice the asymmetry in that chart, because it's a mechanism of its own. Wholesale prices are set in daily commodity-style trading and crash as fast as they spike. Retail prices are set by grocers who change shelf tags less often, sometimes absorb spikes to avoid shocking shoppers, and rebuild margin on the way down — so retail rises quickly but descends on a lag, a pattern USDA ERS explicitly flags. (Grocers also know an egg-buying customer is in the store anyway; eggs are a classic traffic item, sometimes even sold near cost.)

The parts of the price that don't come back down

If eggs crash after every spike, why is a "normal" carton still pricier than it was in 2019? Because underneath the volatility, eggs sit on the same one-way ratchet as the rest of the store. Three structural layers have raised the floor:

Biosecurity is now a permanent cost. Producers have invested heavily in ventilation filtering, truck-washing stations, lasers to deter wild birds, and stricter protocols — running costs that persist in every carton whether or not the virus is circulating. USDA's 2025 response strategy put up to $1 billion into the fight, including cost-sharing for biosecurity upgrades.

The barns themselves are being rebuilt. A growing set of states — California most prominently — require eggs sold in-state to come from cage-free hens, and major retailers have made cage-free pledges. Cage-free systems cost more to build and operate per egg. Whatever one thinks of the animal-welfare tradeoff (a genuine values debate this desk doesn't referee), the mechanical effect is a higher-cost production base phasing in nationwide.

Everything else in the carton's journey. Feed, labor, cartons, diesel, refrigeration — the standard post-2020 cost stack applies to eggs as much as to cereal, and those inputs rarely retreat.

So the honest picture is a spiky line drawn on a gently rising floor: the spikes are avian flu; the floor is the ordinary economics of the modern grocery store.

One more thread deserves a careful, neutral mention, because it surfaces in every egg-price cycle: the question of whether producers profit too much from scarcity. Big spikes reliably produce record industry earnings — the survivors' eggs sell at crisis prices — along with lawsuits and government scrutiny; egg producers have faced both private antitrust litigation over earlier supply-management practices and, more recently, public calls for investigations into pricing during the flu waves. Producers respond that they're selling at market prices set by an auction-like wholesale system while absorbing catastrophic flock losses. Courts and enforcers sort out specific claims; mechanically, both things can be true at once — scarcity pricing enriches unaffected producers automatically, no coordination required, which is exactly why the debate recurs with every wave and resolves nothing between them.

Where does that leave the shopper? With a decoder ring, at least. A sudden egg-price surge on otherwise calm grocery shelves almost always means one thing — birds died somewhere, in large numbers, recently — and carries its own expiration date measured in flock-rebuilding months.

What to watch, mechanically

None of this predicts where egg prices go next — that depends mostly on where wild-bird flu strains go, which nobody controls. But the machinery gives you the checklist that professionals actually watch: confirmed HPAI detections in layer flocks (each announcement is a subtraction from supply), the size of the national layer flock in USDA's monthly counts, wholesale benchmark prices (they move first, in both directions), and the calendar (holiday baking season amplifies everything).

And it hands you the answer to the original riddle. Most grocery prices are made of slow costs, so they ratchet. Egg prices are made of biology, concentration, and a culling policy, so they spike — and, alone in the dairy case, they actually fall back when the barns refill.

Primary Sources

1. USDA Economic Research Service, "Retail egg prices fall, following declining wholesale prices" (2025)
2. USDA Economic Research Service, "Avian influenza outbreaks reduced egg production, driving prices to record highs in 2022"
3. CRS, "U.S. Egg Production and Retail Prices" (In Focus IF12949, 2025)
4. USDA, avian influenza response and egg price strategy (2025)