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chirauyesterday at 10:01 AM3 repliesview on HN

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


Replies

repiretyesterday at 7:29 PM

Lettuce and Tomatoes don't keep well, which adds more seasonal variability and reduces the ability of a futures market to smooth prices.

Compare with potatoes, which keep about as well an onions, and are farmed in the same areas. Look at onions and potatoes over a 5-year time span (because the default all-data time span is silly for this). It doesn't give enough control of the Y axis to make the comparison easy - for potatoes it shows me Y=40-320, for a range of 280; for onions it shows me Y=120-440, for a range of 320. This means that potatoes are more "zoomed in" and it's graph will exaggerate volatility relative to onions, but qualitatively, I'd say the potato graph looks smother just the same. This is exactly what economic theory says a futures market should do to the price.

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bz_bz_bzyesterday at 3:48 PM

None of the products you’ve chosen have a substantial futures market, which is why the person you responded to chose corn to make their point.

gradus_adyesterday at 11:51 AM

The weather affects all crops

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