Most consumers do not do the math like a competitor will. Customers see 3.99 for something larger than a 12 pack and think it is a good deal. No offense but 3/8.88 confuses more people on price than it will make realize it is a better deal.
Jewel more than likely came to Pepsi for an exclusive package for their stores. Albertsons (same co different name) here usually wants Pepsi to special package 24 packs with a bunch of albertsons only coupons. Pepsi will do so but at a higher cost to the store than if the store just went to kinkos and printed a bunch of flyers and taped them to the existing 24 packs.
Most of the managers think it is a load of BS that they are required to take them and keep them until they are gone, but that is one of the stips that Pepsi has in order to produce them for Albys.
If what you did yesterday still looks big, you haven't done much today.