Every economic medium was selected for the write permission it granted the edge, and paid for it by centralizing something else: remembered → self-verify → value → coordinate → settle/issue → mean. Meaning is the last enclosure, and its constraint just expired.
The economic record is not a description of the economy; it is the economy's computation. Every economic-media innovation is therefore an accounting innovation: a change in who can write what into the shared record. The history has a mechanic.
The tablet and the tally (~3000 BCE) granted the permission to be remembered: obligation survives memory, distance, and death, so strangers can contract. The price: literacy was scarce, and meaning centralized with the scribe and the temple. Double-entry (~1300s) granted self-verification: books that check themselves, provable economic state without an authority's blessing. The price: everything forced into scalar money-balances, and the surplus category hardened into profit. The market (~1800s) granted the permission to value: the price is a public, continuously rewritten valuation entry, and anyone's trade moves it. The price: one signal; all meaning crushed to a scalar. The platform (~2000s) granted network-scale coordination without a firm, running multi-dimensional accounting at planetary scale. The price: the richer ledger was enclosed — semiotic write for the edge, economic read-only. Blockchain (~2010s) granted the edge settlement and issuance, and bought integrity by making everyone hold the same record: one global ledger, meaning centralized still.
Each permission was paid for by a compression, rational under its era's computational constraint. The enclosed register accumulates pressure; the next medium is selected precisely because it grants what the last withheld. A ratchet, edge-ward. The register every medium has withheld is meaning itself, and the constraint that made withholding rational has expired.
Depth: the full write-permission history lives at public/depth/evolution-of-economic-computation-v2.md.
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