Product-group price league
Every group starts at 100 on 6 Jul 2026. A group at 112 has seen its prices rise 12% since then. All groups are compared over the same dates, 6 Jul 2026 to 7 Oct 2026, with membership fixed. Tap a group for its chart and what moved it.
How this works
Groups are formed only from descriptions of what listings do, clustered with HDBSCAN. Prices play no part in grouping. 5,542 listings with price history were clustered; 25% did not fit any group clearly and are left out.
Each index is chained from our accepted daily price changes for the group's members, the same validated changes behind the AEPI, and starts at 100 on 6 Jul 2026.
Unranked groups had fewer than 3 priced listings on more than 10% of the window's days, too little evidence to rank. They are shown in place by their price change, marked unranked.
Ranking uses the change over the same window for every group. The percentile is the share of other ranked groups with a smaller change: the 95th percentile means a bigger rise than roughly 95% of them.
"Mostly one listing" marks a group where one listing accounts for at least half of the price movement. Price changes are infrequent, so a single repricing can move a whole group.
Group snapshot grp-20261007-0205-802b02. This is an index of observed list prices, not a market price.