Farm Action, a U.S. farmer advocacy group, sent a letter to the Federal Trade Commission accusing egg companies of fixing prices, blaming it on avian flu and inflation. According to the letter, the bout of avian flu in 2015 killed more birds. Prices doubled at the time, increasing from $1.29 to $2.61. This year, egg prices increased from $1.79 to $4.25 — a $2.46 increase.

Farm Action highlights record profits for egg companies as evidence of price fixing. The letter asked the federal agency to investigate the nation’s largest egg producers.

Read more on the issue here.