E.g. given the historical data, I could see price movements for a product across the two chains. And you won't believe what I found (well, you know what's coming...)

Them fine grocery chains changed the prices of the self-branded low cost products with one to two days, or even on the same day. And they both came up with the exact same price.

https://cdn.masto.host/mastodongamedevplace/media_attachments/files/111/071/514/351/551/937/original/80a37e6d400ecb14.png

https://cdn.masto.host/mastodongamedevplace/media_attachments/files/111/071/516/459/158/757/original/3a1cbcf3cc3e1777.png

https://cdn.masto.host/mastodongamedevplace/media_attachments/files/111/071/517/372/390/085/original/23faf5a79dceb321.png