How do scarcity and shortages affect prices and conflict in an RPG world?

Raising prices is only the first hour of a shortage

The default GM move when goods run short is to double the price and continue as before. It reads as a tax rather than a crisis: the party pays more, grumbles, and moves on, while the town behaves exactly as it did when shelves were full. Nothing about the shortage touches anyone except through coin.

Real pressure changes conduct before it changes arithmetic. Bakers shorten loaves and blame millers, guards start checking carts, neighbours report hoarders, a temple kitchen lengthens its queue, and someone the party knows begins selling from an alley. Each response has an owner with a motive, which means each one can be questioned, bribed, threatened, or aided. That is what turns a missing good into play instead of a surcharge.

Five links from a missing good to visible pressure

Trace these for one scarce thing at a time. One line each is enough to run a session:

• What is missing, and why Name the good and one primary cause the players can understand: charcoal because a monster den closed the woods road, grain after a wet harvest, iron bars while the pass is held. Add secondary causes when they create useful choices, such as requisition alongside a poor harvest. Keep the shortage legible without making it simpler than the world around it.
• Who loses access first Shortages never land evenly. Ask who loses access first and who is protected longest, then why: income matters, but so do contracts, ration priority, military requisition, location, stockpiles, credit, guild ties, and political favour. The people who feel the shortage first may have the least power to respond; a council, guild, army, or wealthy merchant may be able to act sooner.
• How behaviour changes Give each affected group a plausible response: conserve, ration, redistribute, bargain, import from farther away, change production, switch to substitutes, migrate, hoard, or smuggle. Different responses make the shortage visible from several angles; they need not lead to violence.
• Where claims collide Find responses that cannot all be satisfied: smiths need charcoal for tools while householders need it for heat, or the garrison requisitions grain the bakers already promised. They might bargain, share, or accept limits; open conflict becomes likely when their claims stay incompatible and someone chooses to enforce one over another. Note who decides and what is at stake.
• What the party can see Translate every link into something observable without exposition: a shorter loaf, a closed smithy, a queue, a new checkpoint, a friend selling ration tokens, a brawl at the wood yard. If a link has no visible sign, the players cannot engage with it, so it may as well not exist.

Keep numbers impressionistic throughout. Dearer, short, closed, queued, and guarded carry the whole effect; exact percentages add bookkeeping without adding decisions.

Keep the arithmetic light and the owners heavy

Resist building a price model with stages and multipliers. Scarcity changes the terms of access, and price is only one of them: quantity, quality, waiting time, ration size, eligibility, payment terms, favours, substitutes, and enforcement can all change. A three-word scale per good (plentiful, tight, scarce) plus one visible sign each is enough to run a shortage across sessions. Recovery can come from clearing the den or opening a new supply, but also from lower demand, accepted substitutes, stable rationing, released stocks, changed production, a new supplier, a turning season, or a lifted restriction. Show the relief through longer loaves, open shutters, or a shorter queue.

Put the bookkeeping into owners instead. One line per claimant — what they need, what they hold, what they can do, and how urgent it is — tells you who may act between sessions and who might approach the party first. Urgency and capacity differ: a household may need change fastest but have little leverage, while a council or guild can act early to protect its future position. That gap gives the party people to help, persuade, or challenge.

Before the shortage reaches the table

For each scarce good, confirm:

• Can you name one primary cause the party could understand, with any useful secondary causes?
• Who loses access first, who is protected longest, and why?
• Does each affected group have its own characteristic response, not just higher prices?
• Which groups' responses are incompatible, and could they bargain, adapt, or cooperate before conflict?
• Is every link visible as changed terms, a queue, closure, checkpoint, or face the party knows?
• Who needs change most urgently, who has capacity to act, and what can each do or offer?