Roblox Economy Design

Currency Types

• Soft Currency (e.g. "Gold"): Earned through gameplay. Primary transaction currency.
• Premium Currency (e.g. "Gems"): Earned rarely or purchased with Robux. For premium items, boosts, skips.
• Tokens (e.g. "Event Points"): Limited-time currency for event rewards. Expires or resets per event.
• XP/Level: Not a currency but follows similar curve design.

Faucets vs Sinks

Faucets (currency enters)

• Quest/mission rewards
• Level-up bonuses
• Daily login rewards
• Enemy/NPC drops
• PvP/minigame wins
• Selling items (inventory → currency)
• Achievement rewards
• Rebirth/prestige bonuses

Sinks (currency leaves)

• Item purchases
• Upgrades (permanent improvements)
• Repair/durability costs
• Cosmetic purchases
• Trading taxes (10-20%)
• Revive/retry fees
• Expiring consumables
• Gacha/lootbox rolls

Time-to-Earn Targets

Item: Legendary Sword
Price: 10,000 Gold
Average gold/min (new player): 50/min → 200 min (3.3 hours)
Average gold/min (level 20): 150/min → 67 min (1.1 hours)

Inflation Control

• Hard sinks: Premium upgrades that scale with progression
• Variable pricing: Scale prices with player level or economy velocity
• Seasonal resets: Event currencies that expire
• Luxury goods: High-tier items that absorb large currency amounts
• Trading taxes: 10-20% removed per transaction
• Durability/repair: Ongoing costs for powerful items
• Prestige/rebirth: Reset currency for permanent multipliers

Trading System Design

Atomic Trade Pattern

-- Server-side trade execution
local function executeTrade(player1Data, player2Data, offer1, offer2): boolean
    -- Verify both players still have their offered items
    if not hasItems(player1Data, offer1) then return false end
    if not hasItems(player2Data, offer2) then return false end

    -- Execute atomically
    removeItems(player1Data, offer1)
    removeItems(player2Data, offer2)
    addItems(player1Data, offer2)
    addItems(player2Data, offer1)

    -- Apply tax (remove currency portion)
    local tax1 = math.floor(offer1.currency * 0.1)
    local tax2 = math.floor(offer2.currency * 0.1)
    player1Data.Gold -= tax1
    player2Data.Gold -= tax2

    return true
end

Anti-Scam Rules

• Both players must confirm twice (propose → review → confirm)
• Show exact items being traded with rarity/value indicators
• Cooldown between trades (prevent rapid-fire scam attempts)
• Log all trades server-side for rollback capability
• Value warnings: "You are trading a Legendary item for a Common item. Are you sure?"

Monetization Integration

Robux → Premium Currency

• Never sell soft currency directly for Robux (causes instant inflation)
• Sell premium currency that buys exclusive items OR time-skips
• Time-skips should save time, not provide power (pay-to-skip, not pay-to-win)

GamePass Design

• Permanent multipliers (2x Gold) are inflation accelerators. Cap them or scale prices.
• Cosmetic-only passes have zero economy impact (safest)
• Inventory expansion passes are good sinks (player pays for convenience)

Battle Pass / Season Pass

• Free track: enough rewards to feel progress
• Premium track: cosmetics + currency + exclusive items
• End-of-season: unconverted premium currency expires (sink)

Economy Health Metrics

-- Log economy metrics per player session
AnalyticsService:LogEconomyEvent(player, {
    flowType = Enum.AnalyticsEconomyFlowType.Source, -- or Sink
    currencyType = "Gold",
    amount = amount,
    transactionType = "QuestReward", -- or "Purchase", "Trade", etc.
    itemSKU = itemId, -- what was bought/earned
})

• Earn rate by level: Are high-level players earning disproportionately?
• Sink participation: What % of players use each sink?
• Currency stockpile distribution: Are top 1% hoarding?
• Time-to-first-purchase: How long before new players buy something?
• Trade volume: Is the trading economy healthy or dead?

Common Mistakes

• Infinite faucets, finite sinks: Eventually everyone has everything. Game dies.
• Rewarding AFK: Players will AFK-farm any passive income. Gate rewards behind active play.
• Linear scaling: If level 1 earns 10/min and level 100 earns 1000/min, prices must scale too or early content becomes free.
• No early wins: If the first meaningful purchase is 2 hours away, new players leave in 10 minutes.
• Tradeable premium currency: Creates real-money trading (RMT) markets. Usually bad.
• No tax on trades: Currency circulates forever without leaving the economy.