TXN-0042
Genus: Handshake / Family: Trust
Specimen No. 042
The Handshake Protocol
An exchange of grip, pressure and intent
Among the oldest of all transactions, the handshake settles a contract through pure tactile witness. No ledger is written, yet the body remembers. We have catalogued seventeen distinct dialects of handshake, from the Mercantile Vise of Antwerp to the Reluctant Kiss of provincial diplomats.
TXN-0107
Genus: Coinage
Of Coins & Their Wear
Currency considered as artefact
Each coin carries the residue of every palm it has graced. We measure the half-life of inscriptions, the patina of circulation, the precise point at which a ducat ceases to be money and becomes memory.
TXN-0211
Genus: Barter
Goats for Salt
The pre-monetary parable
Three goats for a measure of rock salt: a transaction whose precise rate of exchange has fluctuated for four millennia, and whose mathematical elegance no spreadsheet has ever quite captured.
TXN-0356
Genus: Gift / Family: Reciprocity
Specimen No. 356
The Reciprocal Gift
An exchange disguised as generosity
Every gift is a debt in formal attire. Our department of comparative reciprocity has spent two decades plotting the half-lives of obligation, the polite intervals before re-gifting, and the ceremonial architecture of the thank-you note as financial instrument.
TXN-0488
Genus: Wager
The Wager
Exchange of certainty for thrill
The transaction at the racecourse is not for the horse, but for the felt-edged moment between the bell and the line.
TXN-0512
Genus: Toll
Tolls & Threshold
Coin laid upon the gate
A small coin paid not for a thing but for the right to pass; the original transaction with geography itself.
TXN-0601
Genus: Auction
The Auctioneer's Glass
Time pressed into a single drop
An hour of patient speculation reduced to the third lift of a paddle. Our museum holds the gavel of A. Pemberton, with which were sold — in a single afternoon — a Bavarian abbey, four crates of saffron, and one greying tortoise of dubious provenance.
TXN-0744
Genus: Tribute
Tribute & Its Discontents
Asymmetric exchange under duress
A transaction whose participants disagree, often violently, about whether it has occurred. The taxonomy of tribute is necessarily comparative: the receiver insists on its voluntariness, the giver upon its unrepayable cost.
TXN-0888
Genus: Loan / Family: Promise
Specimen No. 888
The Promissory Loan
A ribbon tied around the future
Lending is the most temporally extravagant of all exchanges: an object exits one hand expecting to return, escorted by a small entourage of interest. The ribbon must be replaced periodically, lest it slacken, in which case it is renamed default.