re: The US BLS has announced that coffee prices will no longer be factored into CPI inflation

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That specific series that’s being removed has not increased 78% since Sept. 2023. The actual average price has been falling.

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Actually, that is the one that is remaining the one that is being removed is:

Series ID 717312 Coffee, 100%, ground roast, 13.1-20 oz. can, per lb. (453.6 gm)

I think I figured out why. I went through the hundreds of canisters of coffee listed on Walmart and only 3 of them were within 13.1 and 20 ounces the vast majority were larger and some were smaller. One of the ones I found was a chicory blend which doesn't count anyway and 2 were expensive specialty products that wouldn't be used either. I think the reality is that coffee is rarely sold in cans of that size anymore assuming Walmart is a reasonable representation of the market. Not the API is very specific so for example 16oz bags would not be used in the above series.