Time for me to re-post my perennial "fun banana facts" post: Bananas are the #1 most-sold item at most grocery stores including, notably, Wal-Mart. Bananas also have the highest standard deviation in terms of predicting if a given (known) consumer will purchase bananas in a given store run. (At least as compared to other food products and consumables.) When predicting a consumer's shop, it's generally pretty easy to…
Berries are most certainly not seasonal anymore. They should be but we thoroughly engineered the seasonality out of them. They're always on the shelf. Do people's purchase habits follow the natural seasonality of the product anymore? Probably something that can be found in this dataset as well.
Depends on the store I'd wager. We have a store here (Ametller Origen) that sell things they cultivate/make themselves "nearby" (in the same region, and among other things they sell too) and sell in their own retail stores, I'm guessing most of their customers do indeed follow the habits of seasonality as lots of stuff isn't available outside of the seasons.