Interest Rates, Currencies and the Price of an Egg

On 16 September 2026 the US Federal Reserve raised its policy rate by a quarter point, to a range of 3.75 to 4 percent, its first increase since July 2023, citing inflation that "remains elevated." Nothing in that decision mentions eggs. But for countries that grow their eggs at home while importing what their hens eat, monetary policy in Washington is one of the quieter forces behind the price of a tray. This column follows that chain link by link, and shows where it breaks.

Feed is the largest single cost in producing an egg, and in East Asia most of it is bought abroad. According to the Korea Feed Association, imports supplied about 79 percent of the raw materials used in Korean compound feed in 2025, and essentially all of the feed corn was imported. Japan is in a similar position. Those grains are priced in US dollars on world markets, so a farmer in Gyeonggi or Ibaraki pays for them twice over: once at the world price, and again through the exchange rate.

That is why Korean and Japanese eggs can be self-sufficient and still exposed to the dollar. The eggs never cross a border, but their main ingredient does.

Higher US rates tend to strengthen the dollar against currencies such as the won and the yen, because dollar assets pay more. A weaker won means each tonne of imported corn costs more in won even if its dollar price does not change. A Korea Rural Economic Institute study cited in October estimated that a 10 percent rise in the won-dollar rate lifts domestic feed prices by about 5.7 percent, and that a 10 percent rise in feed prices lifts poultry prices by roughly the same proportion.

In 2026 the won came under heavy pressure in the spring. It passed 1,530 won to the dollar at the end of March, and Korean feed makers said they could no longer absorb the cost. Japanese feed suppliers raised prices for the April to June and July to September quarters, naming the weak yen among the causes alongside grain futures and freight.

The chain has a built-in delay. Grain is contracted, shipped, landed and milled over several months, so a currency move shows up in feed prices well after it happens on the trading screen. By August, Korea's average compound feed price had reached 648 won per kilogram, its highest since late 2023, according to agriculture ministry figures. Yet by then the won had already recovered to around 1,350 per dollar. Farmers asked for cuts; feed makers replied that they were still using grain bought at the spring exchange rate.

The currency was not the only push. A war involving the United States, Israel and Iran disrupted shipping around the Strait of Hormuz, and the FAO's cereal price index in September stood about 17 percent higher than a year earlier. A cheaper won would have softened that rise; it could not cancel it.

The clearest lesson of 2026 is how easily other forces overwhelm this one. Korea's egg price spike earlier in the year came overwhelmingly from bird flu, which removed millions of laying hens; feed and currency costs were a background pressure, not the trigger. In the United States, retail egg prices were forecast to fall by nearly 30 percent over the year even as the Fed was tightening, because flocks were rebuilding after earlier outbreaks. And the timing does not line up neatly: the Fed raised rates in September, while the won had strengthened by then.

Interest rates also work through a second, slower channel: the cost of borrowing to build or refit poultry houses. That matters in Korea, where a rule requiring more space per hen takes full effect in September 2027 and many farms must invest before then. Dearer credit can delay that investment and slow the rebuilding of flocks after an outbreak. It is a real effect, but one measured in years rather than weeks.

Because exchange rates move dollar-converted prices on their own, the trend charts on this site's country pages are drawn in local currency. A rise in a Korean or Japanese line reflects a change in what shoppers actually pay, not a swing in the dollar. Read the dollar ranking for comparison across countries, and the local-currency chart for what happened inside one.

The practical takeaway is modest. When the dollar strengthens sharply, expect feed costs in import-dependent countries to rise a few months later and egg prices to feel some upward pressure. When a bird-flu outbreak strikes, expect that pressure to be drowned out.