week-over-week eBay sold volume spikes by player/set as flagged by a card market newsletter
This is a catalogued data feed with a research idea attached, not a validated edge. Being listed here means it has a specific source and a one-sentence causal mechanism mapped to what it should move — it doesn’t mean it has cleared the five-stage validation gate (point-in-time hygiene, out-of-sample holdout, multiple-testing correction, and the portfolio-layer backstop). As of today, every score on this site is prior-only; zero signals in the catalog have been promoted to “measured” status. See the methodology page for the full validation process and current counts.
Browse the rest of Luxury & Collectibles — Resale and auction data for watches, sneakers, art, and collectibles — a read on discretionary wealth and status spend.