David Mar
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Card Market

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The round trip on a collectable card costs 44% of the ask — and never less, at any price.

datamarketscollectiblespython
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About this project

A market-health read on Magic: The Gathering singles, built from 32.8 million daily dealer quotes in MTGJSON. Card Kingdom is the only source that publishes a buylist as well as a retail price, which makes a genuine round trip observable — one dealer's ask against its own bid, on the same card, on the same day, rather than a spread stitched from two venues that never trade with each other. The answers mostly cut against the case for treating cards as an asset: the round trip costs 44% of the ask on a $20–100 card and never falls below that at any price; 46% of the printings the dealer sells it will not buy back at all, worst at $100–500; two major venues quoting the same card the same day sit a median 32% apart; and two thirds of the basket's value sits in one card in a hundred. One expected finding did not appear and is reported as the null it is — the stale-price smoothing that flatters art indices is absent here, because repricing is lumpy but the jumps are large.

Details

Created
August 25, 2026
Last updated
August 26, 2026
Type
Embedded app