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adrien d5305da449 Gave the world a simple economy: one pool per nation and a global market

The simple economy is now the default and the old simulation is frozen as the hard model, selectable per game. A nation keeps one resource pool available in every region, fed by public production works rather than private per-region stores, and construction and training begin at once, paced by the region's spare power instead of gathering materials over days.

Money is euro only: a per-inhabitant daily tax funds a treasury spent in a global market, where buy and sell lots trade against the world stock and move its price. The hard economy keeps its per-nation currencies, central banks and exchange rates.

Simple games skip the price-settling warmup and economic migration; the snapshot carries the economy model, the market and the pool figures the client draws. Added the matching test suites and the design briefs under docs/simple_economy.

2026-09-25 14:58:49 +02:00

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07 — Procurement from the pool, no bidding

Depends on: 01-, 02-.

Goal

All regions procure their resources from their player's global resource pool. There is no bidding, no local sourcing, no distance and no per-region pricing.

Current behaviour (hard economy)

Procurement is a cost-ordered search across reachable stores and the world market:
- _procureFromNeighbours(city, id, amount, haul, nodes, opts)
- _nearbySuppliers, _resourceNodes, _resourceNodeAt, _nodeSurplus
- _tradeGraph / _cityMarketAccess (the expensive sea-lane flood, cached)
- _marketUnitCost(id) = market price + energy freight per unit.
Consumers call the above from many places: _payConstructionResources, payCombatResources, _gatherSiteMaterials, _gatherBuildEntry, _drawFromNearest, _buyBuildingMaterials, plus food/upkeep in _tickResources and _consumeCityResources.
resourceSpend records what a nation bought/sold for the budget panel.

Target behaviour

In simple mode, procurement is a single subtraction from the owner's pool: _drawFromPool(civ, id, amount) returns what was available and decrements the pool. No ordering beyond resource id, no suppliers, no distance, no freight.
Replace each consumer's procurement call in simple mode with a pool draw:
- building/training material bills (03-),
- upkeep and city consumption in the daily tick,
- combat and repairs,
- anything that currently calls _procureFromNeighbours or _drawFromNearest.
No bidding. The old MONEY.bidPremium / maxBidMultiplier behaviour and _nearbySuppliers price escalation must never run in simple mode. If a consumer used to bid, it now simply takes from the pool; a shortfall is a shortage (the work stalls or the need goes unmet), never a higher price.
No transport bill. RESOURCE_RULES.deliveryEnergy, the trade graph and the delivery overlay are hard-economy concerns. Do not compute them in simple mode; skip _tradeGraph rebuilds entirely.
Keep the day's ledger (resourceSpend, consumption/production totals) so the Resources tab and budget can still report flows. Only the sourcing changes.
Prices for any valuation that remains (budget forecasts, combat material value) are the global market prices from 06-.

Files

shared/game_state/resources.js — _procureFromNeighbours, _drawFromNearest, _nearbySuppliers, _resourceNodes, _tradeGraph, _cityMarketAccess, _marketUnitCost, _tickResources consumer passes.
shared/game_state/sites.js — _siteBuy, _gatherSiteMaterials, _gatherBuildEntry, _siteUnreachableMaterials.
shared/game_state/industry.js — _buyBuildingMaterials, _buildingMaterialAvailability.
shared/game_state/simple_economy.js — _drawFromPool and the overrides.
tests/simple_procurement_test.js — new.

Acceptance criteria

Ordering a build/unit in simple mode never calls the trade graph or supplier search and never charges a transport premium.
Consumption and production move the player's pool by exact amounts.
A pool shortfall leaves the need unmet / the work stalled, with no price bid.
The hard economy procurement path is byte-for-byte unchanged.

Notes / decisions

Priority of draws. If several needs compete in one tick, define an order (e.g. food before industry before construction) so the simulation is deterministic. Recommendation: food/upkeep first, then industry inputs, then construction.
Shortage consequence. In hard mode a shortfall triggers shortagePopularityPenalty and grid throttling. Decide whether a pool shortfall keeps those penalties. Recommendation: keep the popularity penalty; drop the per-region grid throttle since energy stays regional and is handled in 03-.
_marketUnitCost for quotes. Where the UI quotes a delivered price, in simple mode it is just marketPrice(id) from 06-.

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