Live promotions, priced per unit and graded against the market

promoPrice is what one unit costs under the promotion, after minQty is divided out. The baseline is the median price of the same barcode at the OTHER chains, one price per chain, so a chain that raised a price in order to cut it does not appear here. grade is real at or below 80% of that median, not_a_deal at or above it, ordinary between.