Journal.

A printed bestiary will tell you a longsword is 15 gp and a horse is 75 gp. A working economy will not, and the reason it will not is what this journal is for. The flat price on the page is a bookmark; the campaign has to live between the bookmarks, and that is where the pricing gets interesting.

Tallyrune's economy work begins from a simple premise: an in-world currency is not a number, it is a system. The system has a region's supply, a court's willingness to debase, and a scarcity surface that varies by season and by saddle. Treat the gold piece as a flat number and the economy is decorative; treat it as a system and the economy starts to do its job at the table.

The four frames below — regional supply, debasement, scarcity, and the flat number that flattens the first three — are the working vocabulary of that system. They are not a checklist; they are a grade of lens, and the point of the lens is to read a printed number the way a campaign reads a printed map: as a starting position, not as the territory itself.

Three frames for in-world money

The first frame is supply, and supply is regional. A longsword in the Vale is not a longsword in a port city. It is a longsword priced against a forge, a journeyman wage, a smith-coal tariff, a guild-coin, and a road tariff at the saddle that may add a half-day of work to a single delivery. None of that lands at the same number as the printed price; it lands at whatever number the four-axis rubric the journal keeps returning to says it should.

The second frame is debasement. A court that is short on silver does not stop minting coin; it lowers the silver content. A working economy tells the GM when the kingdom started doing this and what the price of bread did in the season after, because the price of bread is the audit a printed module rarely names. A flat number cannot carry that audit; a system can.

The third frame is scarcity. Salt under tariff is one scarcity; salt after a bad spring is another. The economy stays alive when the GM can read into the second, and a flat number silences that read.

Debasement is a system, not a typo

A king’s treasury does not run out the way a player’s hit points do. It runs down in slow, callable movements: a forced loan, a clipped coin, a tax farm sold off to a favorite. Each one is a system event, and each one ripples through the price of a flagon at the inn before the players ever hear about it. When the campaign priced the flagon at 4 cp last session and 6 cp this session, what changed between the two was not the flagon, it was the borrowing.

A ledger that names the borrowing is a regional economy. A ledger that hides the borrowing under a flat number is a coupon book. The journal will keep returning to this — the difference between a campaign that knows what its town did this season and a campaign that read the same number twice.

Scarcity is regional, not global

A scarcity surface is not a list of scarce things; it is the rate at which scarcity moves from one good to the next. Salt scarcer than iron in winter, iron scarcer than salt at war, salt scarce again the season the caravans lose the saddle. Build the surface for one good, then keep spreading it to the next.

The journal treats scarcity as something the GM keeps in the back of the GM’s head, not something the GM keeps at the table. A working economy has more scarcity surfaces than it can name on a session zero; it just has to remember which one is currently running.

Where flat numbers buy silence

Once the four-axis rubric is in the campaign, the printed price on the longsword stops being a number and becomes an averaging. A 15 gp longsword is the average of nineteen regions the module author priced long before the GM picked up the book. The regional reading is the price the GM will defend at the table when the player picks up the longsword and asks what a longsword is worth.

This is the work Tallyrune does in the next three pages: the regional reading that turns a flat number into a system. The journal collects the work behind the four-axis rubric, the ledger rubric that keeps cropping up across the primers and the toolkits, and the campaign primer that turns one region into four sessions. The first essay is a summary; the rest of the site is the detail.

Next time the campaign prices a flagon at the inn: write the price, then write what changed since last session. If the players cannot tell you what changed, the price is flat; if they can, the price is moving. A flat price is a coupon. A moving price is an economy. The rest of Tallyrune is the rubric for the second kind.