La Sisa measures the hidden inflation in shrinking packages

Field notes

The catalogue separates long-run comparisons from recent changes: 94 cases compare 2003 with the present, while 15 cover 2024 to 2026. Each ficha reports both package-level and unit-price changes, which prevents a higher sticker price from obscuring a smaller quantity. Filters also distinguish manufacturer brands from store brands and flag products that have shrunk twice. The site notes that product images identify references but are not dated evidence; gram weights come from the underlying dataset.