adrien
71dad18e8d
Central banks now redeem the national money foreign banks hold, sell reserves to defend a weak rate, and cover part of strategic imports from reserves. Five repeatable technologies raise each commodity's output per unit of energy. Hostile troops on a road or sea lane sever trade, power and unit supply. Middlemen buy food to resell to neighbours at a markup, and starving regions buy before those topping up their buffers, which clears the landlocked famines. The economic map's trade graph gains a colour legend.
114 lines
5.1 KiB
JavaScript
114 lines
5.1 KiB
JavaScript
// National economy constants and the pure formulas the server and the browser
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// both use to derive production, training time, budget income and population
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// growth.
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// Trade taxes are the government's only revenue; there is no GDP-based tax.
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// Every region buying from another region inside the country pays a national
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// sales tax on top of the price. A foreign buyer pays an export tariff to the
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// seller's government, and a region buying from abroad pays an import tariff to
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// its own government on the national currency it spent acquiring the foreign
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// currency. Rates are per nation and may be overridden per resource.
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export const TAXES = {
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defaultSales: 0.2,
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defaultExport: 0.05,
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defaultImport: 0.05,
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// The highest rate a player may set, per kind and resource.
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maxRate: 1.0,
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// The three tax kinds, in the order the panels list them.
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kinds: ["sales", "export", "import"],
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};
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// The buckets the monthly budget report groups a nation's spending into. Each
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// row carries a signed cash movement (positive is money into the treasury) and,
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// for the upkeep rows, the market value of the materials consumed whether they
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// were drawn from stores or bought. `group` is the heading the table files the
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// row under.
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export const BUDGET_EXPENSE_CATEGORIES = [
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{ id: "buildings", label: "Building upkeep", group: "Upkeep" },
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{ id: "units", label: "Unit upkeep", group: "Upkeep" },
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{ id: "works", label: "Tile works", group: "Upkeep" },
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{ id: "transport", label: "Transport", group: "Upkeep" },
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{ id: "campaign", label: "Campaign", group: "Government" },
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{ id: "construction", label: "Construction", group: "Investment" },
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{ id: "training", label: "Training", group: "Investment" },
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{ id: "tilebuild", label: "Tile improvements", group: "Investment" },
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{ id: "provisioning", label: "Provisioning", group: "Resources" },
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{ id: "energy", label: "Power", group: "Resources" },
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{ id: "military", label: "Military supplies", group: "Resources" },
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];
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// The monetary system: each nation issues its own currency and runs a central
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// bank. Regions are the private sector, each holding a basket of currencies.
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// When their cash runs out they borrow from the central bank, and the same bank
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// lets the government run an overdraft. The interest rate is the cost of that
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// borrowing, not a direct lever on inflation.
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export const MONEY = {
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// The central bank's opening lending rate, charged on every debt each year,
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// and the ceiling a player may set.
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defaultInterestRate: 0.02,
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maxInterestRate: 0.5,
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// Private-sector cash a region opens with, as a share of its yearly GDP.
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privateCashFraction: 0.5,
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// Each day a region converts this share of every foreign holding back into its
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// own currency.
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repatriationPerDay: 0.05,
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// How much a currency's value may move from par, either way.
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maxRateDrift: 0.9,
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// How hard a day's net foreign demand pushes a currency's value.
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demandSensitivity: 0.5,
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// When several regions chase the same scarce surplus, each further buyer
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// raises the price it pays by this share, capped at `maxBidMultiplier`.
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bidPremium: 0.3,
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maxBidMultiplier: 2,
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// The central bank's foreign-exchange desk. It works the reserves the nation
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// earned abroad: it retires the national money foreign banks hold, sells more
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// reserves to defend a weak rate, and pays part of the nation's foreign
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// purchases out of reserves to keep food and energy imports cheap.
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fx: {
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// Share of the bank's foreign reserves spent redeeming the national money
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// held abroad on an ordinary day.
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redemptionPerDay: 0.004,
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// Extra share sold on a day the national currency sits below `weakBelow`.
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interventionPerDay: 0.05,
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// The value against par the bank treats as a weak rate to defend.
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weakBelow: 0.98,
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// The share of a foreign purchase of each resource the bank covers from its
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// reserves, and the most of its reserves it will spend subsidising imports
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// in one day.
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importSubsidy: { food: 0.5, energy: 0.5, steel: 0.25, luxury: 0, hightech: 0.25 },
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importSubsidyPerDay: 0.02,
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},
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};
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export const ECONOMY = {
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basePopulation: 100_000,
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cityTileProductionMultiplier: 2.0,
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capitalTileProductionMultiplier: 2.5,
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citySurroundingProductionBonus: 0.3,
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gdpPerProductionPoint: 100_000,
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// A nation opens the game on 1 January 2000 with a tenth of its starting GDP.
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startingBudgetFraction: 0.1,
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startingBudget: 1_000_000_000,
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basePopulationGrowthRate: 0.005,
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// Natural growth of production: every day a tile gains this share of the
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// production it opened the game with. The amount is constant, so the relative
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// growth rate naturally tapers off as the years pass.
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naturalProductionGrowthPerDay: 0.0001,
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productionCapacity(gdp) {
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if (this.gdpPerProductionPoint <= 0) return 0;
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return gdp / this.gdpPerProductionPoint;
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},
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trainingHours(gdp, cost) {
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const capacity = this.productionCapacity(gdp);
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if (capacity <= 0) return 0;
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return cost / capacity;
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},
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populationGrowthFactor(hoursPerYear, hours = 1) {
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if (this.basePopulationGrowthRate <= 0 || hoursPerYear <= 0 || hours <= 0) return 0;
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return Math.pow(1 + this.basePopulationGrowthRate, hours / hoursPerYear) - 1;
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},
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};
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