Comment by chirau

I looked up onions, lettuce and tomatoes (because burgers), and the volatility actually looks very similar. Am I missing something or looking at the wrong things?

Tomato: https://fred.stlouisfed.org/series/WPU01130217 Onion: https://fred.stlouisfed.org/series/WPU01130216 Lettuce: https://fred.stlouisfed.org/series/WPU01130215