One Thousand and One Conjectures

Price elasticity — the workhorse concept of consumer economics — is here applied to the length of medieval letters. Writing surfaces were a real cost of correspondence: parchment was expensive, and the paper that spread through the medieval Mediterranean made the surface…

Gresham's law — bad money drives out good — is here joined to the physics of phase transitions. The conjecture is that the driving-out is not gradual: when rulers debase the coinage, users tolerate the slide in silver fineness up to a…

Nominal wage rigidity — the Keynesian observation that wages resist adjustment even when prices move — is here pushed back four thousand years to the ration lists of Ur III Mesopotamia. Ur III institutions paid workers standardized rations of beer and barley,…

The backward-bending supply curve — the textbook anomaly in which workers with an income target respond to falling prices by working more, not less — is here joined to the fate of Norse Greenland. The colony's export staple was walrus ivory, and…

A forecaster facing a high-stakes, high-uncertainty question hedges — wide intervals, conditional phrasing — because a confident miss is fatal to credibility; options markets price the same logic as implied volatility. The oracle at Delphi faced the identical institutional problem for a…

Joins index-number theory — the chained construction behind the modern consumer price index — to Tamil temple epigraphy. Thousands of dated Chola-era endowment inscriptions record in stone the rates of paddy, ghee, and oil required to keep a temple lamp burning in…

Joins actuarial insurance pricing to maritime archaeology. A fourth-century BCE Athenian bottomry loan was repaid only if the ship survived the voyage, so the premium over ordinary land-secured interest is a pure risk price: if lenders broke even, the spread directly encodes…

Joins the economics of protection rackets to Han-Xiongnu diplomacy. A racketeer prices extraction to the victim's outside option: what matters is not how hard the racketeer can hit but how badly the victim needs quiet, so payments ratchet up when the victim…

Vertical-monopoly pricing from industrial organization shows that a chain of independent monopolists along one route charges more in total than a single owner would, because each ignores the damage its markup does to the others' traffic. This conjecture reads the toll castles…

The term structure of interest rates — the yield curve — normally slopes upward, because lenders demand compensation for longer exposure to risk. This conjecture says Old Assyrian merchant finance in the Kanesh trade refused that logic: interest in the Kultepe loan…

Price-ceiling economics predicts that goods capped below market price withdraw from legal, recorded exchange, while goods capped at or above market trade on visibly. This conjecture reads Diocletian's Price Edict of 301 CE through that lens: the Edict's famous failure should be…

This connects Ottoman probate evidence with the economics of a copyright-free book market. Where any text could be lawfully recopied by anyone, the work itself commanded no rent; scarcity lived entirely in the object, in the calligraphy, illumination, paper, and binding. The…

Medieval inventories and estate valuations price books, and they let us watch the first European market in fiction behave like a market. This conjecture claims secular literature was the first book class to depreciate with age: in valuations, romances and secular verse…

What did the music in a book cost? Medieval booklists and contracts price books, and this conjecture claims notation was billed as decoration, not expertise: the price premium of a notated service book over its unnotated twin equals the premium for rubrication…

Armenian colophons record not only a book's production but its afterlife: later notes tell of manuscripts seized in raids and bought back by villages, with the prices paid. The claim: ransomed books were priced as captives, not commodities — buy-back prices track…

The verse dedications in Byzantine books vary from two lines to dozens, and the variation looks like poetic whim. This conjecture says it is a price tag: epigram length scales with the market value of the book it crowns, checkable because monastic…

The Paris stationers' taxatio of 1275 and 1304 fixed the rental price of exemplar peciae, so market demand could not show in price; it could only show in how many exemplars of a work the trade stocked. The surprising connection is between…

Geniza book-lists record actual prices paid for books, and colophons occasionally record scribal fees, giving the raw material for a genuine price series of Hebrew books across centuries — something no narrative source provides. Over those same centuries paper spread and cheapened…

Contracts in Roman Egypt stipulate cash penalties for default, and this conjecture joins those clauses to monetary expectations: a penalty prices a breach that may occur years in the future, so in a depreciating currency, notaries and creditors should pad penalty-to-principal ratios…

A palimpsest — a parchment leaf scraped clean and written over — is usually treated as a cultural verdict on the erased text. Join it instead to price theory: the palimpsest share of surviving parchment books is a market barometer, tracking the…

In Roman and Byzantine Egypt, clerks routinely wrote new documents on the blank backs of obsolete ones — the opisthograph, papyrology's scrap paper. Join that habit to price history: the opisthograph share of dated documentary papyri is a high-frequency papyrus price index,…

Everyone knows books were expensive before print and cheap after; the standard picture adds a slow medieval cheapening in between. Join the ancient and medieval price records instead into one series and the conjecture is starker: measured in unskilled day-wages, a plain…

Diocletian's Price Edict tariffs copying by the hundred lines; medieval Hebrew colophons occasionally record what the scribe was paid for the codex. Join these scattered piece-rates through the one deflator every pre-modern economy shares — wheat — and the conjecture is that…

The medieval book trade is usually narrated as commissioning — a patron orders, a scribe copies. Join it instead to the economics of used-goods markets: most transactions in pre-print books were resales, and the liquid second-hand price acted as a ceiling on…

The Black Death is famous for doubling wages; books are famous for being labour-intensive; the obvious inference is that books got much dearer after 1348. The conjecture joins the labour shock to a simultaneous materials shock and says the obvious inference is…

A papyrus roll was a standardized manufactured unit — twenty glued sheets of graded charta — while a finished book was a bespoke object of variable script, size, and finish. Join the two to the economics of commodities versus custom goods: attested…

Papyrus production was a concentrated, licence-hedged Egyptian industry with a Ptolemaic monopoly in its ancestry; wheat was the freest market the ancient world had. Join them through price behaviour: papyrus prices should look administered — nominally rigid for decades, then jumping in…

Copying scripture and copying anything else are usually distinguished theologically; distinguish them economically instead. The conjecture is that sacred copying carried a fixed proportional wage premium over secular copying — a multiplier set by religious rule rather than by local labour markets…

Cost disease — the modern observation that string quartets and haircuts get relatively dearer because their productivity cannot rise while wages elsewhere do — is usually thought a phenomenon of industrial economies. Join it to the copyist: hand-copying was the archetypal stagnant…

Piecework suggests copying should price linearly — twice the folios, twice the fee. The conjecture is that it did not: copying showed economies of scale, with the per-folio fee falling as codices lengthened, because the fixed costs of a commission — procuring…

Medieval coinage was repeatedly debased; grain prices and wages absorbed those shocks slowly and messily. Join debasement history to book prices: books, being durable, resaleable, and easily identified, were priced like plate — as stores of bullion value — so their prices…

Copying manuscripts, teaching letters, and writing documents for the illiterate look like three occupations; the conjecture is that economically they were one, because the same modestly literate people did all three and arbitraged between them, so the effective hourly earnings of copyist,…

Papyrus was sold in named quality grades cut from different parts of the same plant by one fixed process; parchment quality depended on animal, age, region, and finishing skill, all of which could diverge over time. Join the two quality ladders through…

Loan documents from the papyri onward show borrowers pledging movable goods — cloth, tools, jewellery, and sometimes books. Join the book to the pawnshop: books were premier collateral, pledged at loan-to-value ratios near those of silver plate and well above cloth or…