How supermarkets intentionally spike the prices of products then slightly decrease them: framing that as a "discount" -->> www.theguardian.com/business/202... (so many overlaps with emissions accounting tricks and greenwashing math here!)

I know, I know, but: this is entirely illegal. The product has to have been offered at the “regular price” for 90 days prior, in just about every country that has a legal system. Yes, I know. But still.

See the “JC Penny Strategy”

This is quite common in the US, business as usual. Most notably, almost every retailer does this for a week or 2 before “Black Friday,” the shopping day after Thanksgiving Thursday.