WP37
The Hidden Architecture of Grocery Prices: Promotions, Retail Competition, and the Cost of Living in Quebec
Evidence from 300,613 posted-price events across 54 Quebec grocery feeds, August–November 2026
Grocery prices are not a single inflation process. Using a read-only research copy of Food-Ka, a Quebec grocery price aggregator, the paper assembles an auditable panel of 124,579 listings from 54 active source feeds (26 retail companies, two channels: online storefronts and weekly circulars) observed every seven…