adrien
d5305da449
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.
107 lines
5.4 KiB
JavaScript
107 lines
5.4 KiB
JavaScript
// Simple-economy figures, in their own namespace so they cannot collide with
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// the hard economy's ECONOMY, MONEY and RESOURCE_* constants. The simple model
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// is the default from now on; the rich per-region simulation is kept intact as
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// the "hard" model and selected explicitly.
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// The two models a game may run, and the one used when none is given.
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export const ECONOMY_MODELS = ["simple", "hard"];
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export const DEFAULT_ECONOMY_MODEL = "simple";
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export const SIMPLE_ECONOMY = {
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// Tax: every inhabitant pays this many euros a day, scaled by twice the
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// region's approval (a 0..2 factor) and any tax-income modifiers.
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taxPerInhabitant: 100,
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approvalTaxFactor: 2,
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// The one shared currency: there is no conversion, every nation quotes prices
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// in euros.
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euro: { code: "EUR", symbol: "€", name: "Euro" },
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// The fixed euro reserve every nation opens with. Money buys only market
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// goods in the simple economy, so this is day-one buying power rather than a
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// working balance the state spends internally.
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startingTreasury: 1_000_000_000,
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// Propaganda is the one thing culture is spent on: a running campaign drains
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// culture at its hourly rate (the opinion shift scales with that rate just as
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// the hard economy's money spend did), and lapses when the nation can no
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// longer fund it. The hard economy's figures are money, so the simple model
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// keeps its own, sized near a culture building's hourly output.
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campaign: {
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defaultCulturePerHour: 8,
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maxCulturePerHour: 40,
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},
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// The comfortable working stock every nation's single resource pool opens
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// with. Unlike the hard economy's year of per-region reserves this is a fixed
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// figure, not derated from consumption: with one pool per player there is
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// nowhere for a surplus region to hoard, so the opening stock only has to
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// bridge the first works coming online. Energy is not pooled -- it stays a
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// per-region flow (see `03-construction.md`) -- so only the four storable
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// goods appear here.
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startingPool: {
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steel: 1_000_000,
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food: 500_000,
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luxury: 500_000,
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hightech: 20_000,
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},
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// Construction in the simple economy starts the moment it is ordered: there
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// is no materials-gathering phase, and the speed comes from the spare power
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// of the region the work stands in rather than from national GDP.
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construction: {
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// The cost/energy exchange at the heart of simple construction: one euro of
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// build cost needs this many kWh a day of spare regional power to be raised
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// in one hour. A work's base hours are `cost * energyPerConstructionHour /
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// max(available, minEnergy)`, then the building/training ratio below and the
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// usual approval and technology multipliers. A tighter grid raises the same
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// work slower, the opposite of the hard economy's richer-nation-builds-faster.
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energyPerConstructionHour: 3_000,
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// The least spare power a region is credited with, so a blacked-out region
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// still builds -- slowly -- instead of dividing by zero or finishing at
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// once. A tenth of a solar plant's daily output.
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minEnergy: 30_000_000,
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// The hard economy builds ten times faster than it trains a unit of the same
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// cost; the simple economy keeps that ratio.
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buildingTimeMultiplier: 0.1,
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// No work finishes in under an hour, so even a surging grid cannot make a
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// build instant.
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minHours: 1,
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// The fuel-free plants, in preference order, used to guarantee every opening
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// region a power plant. All three are land buildings with no fuel bill, so
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// the simple economy never implies a fuel resource.
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seedPlantIds: ["solar_power_plant", "wind_turbines", "geothermal_plant"],
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},
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};
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// The global market every simple-economy nation buys and sells from. One shared
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// world stock per storable good opens at this figure, and the price is the base
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// price scaled by how far the stock has fallen from it: half the stock doubles
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// the price, a glut cheapens it. Buying drains the stock (raising the price),
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// selling refills it (lowering it), so the two sides of the trade price
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// themselves. A single shared stock, not a per-player order book, matches the
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// formula and the opening figure.
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export const MARKET_START_STOCK = 1_000_000;
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// The only quantities a market order may name, in canonical units. The client
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// offers exactly these three buttons and the server re-validates the lot.
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export const MARKET_LOTS = [100, 2_000, 50_000];
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// The stock a price is never allowed to read below, so an emptied market cannot
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// send the price to infinity (or to NaN on a zero). One thousandth of the
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// opening stock caps the dearest a good can get at a thousand times its base.
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export const MARKET_MIN_STOCK = 1_000;
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// The market price of one good at a given world stock:
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// `basePrice × (stock / MARKET_START_STOCK) ^ -1`, clamped so a low or broken
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// stock stays finite. This is the single source of truth the tick, the order
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// handler and the snapshot all price a good through.
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export function marketPriceFor(basePrice, stock) {
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const available = Number.isFinite(stock) && stock > MARKET_MIN_STOCK
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? stock
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: MARKET_MIN_STOCK;
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return basePrice * Math.pow(available / MARKET_START_STOCK, -1);
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}
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// Coerces a stored or configured model name to a known one. An unknown value
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// falls back to the default rather than throwing, so a typo or a stale save
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// cannot stop a game from starting.
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export function normalizeEconomyModel(value) {
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return ECONOMY_MODELS.includes(value) ? value : DEFAULT_ECONOMY_MODEL;
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}
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