The Joe Jackson index is down 11.28% over this period, -10.65% in the last 7 days against -11.28% over 30. It sits 16.53% below the period high (117 on Oct 30) and 0.00% above the period low (Nov 8).
Downtrend in place; until the 7-day move turns positive, expect the low to be retested.
Arithmetic over the index level series (7/30-day change, daily volatility, drawdown, distance from the period high and low). Not investment advice.
1915 Joe Jackson SGC 3E145 Cracker Jack · $29,700-63.46%2025 Joe Jackson PSA 10Panini National Treasures · $67-14.54%Value-weighted index, base 100 at the window start: the sum of the basket's observed values against the prior day's, chained daily, each card's move capped so one outlier can't dominate. Values come from real comparable sales resolved on Slabline card pages. The window deepens automatically as history accumulates. Long-run history reflects the 11 most-traded cards in this basket; the recent window covers all 32 tracked cards. Not investment advice.
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