Designing a Game Economy That Doesn't Crash

I'm designing a mobile game with a virtual currency system. How do I prevent runaway inflation while still making the economy fun?

Great question! Let's think about your game economy like a real economy, but with total control. The inflation problem: Players constantly generate coins (quest rewards, battles, sales). If coins only enter and never leave, hyperinflation happens. New players become priced out of everything. Real game economies solve this with SINKS: 1. Consumables (potions, crafting materials) 2. Decay and Tax (repair costs, auction house fees) 3. Progression gates (unlock costs, upgrade costs) 4. Luxury and Vanity (cosmetics that don't affect gameplay) The golden ratio: For every 100 coins entering the economy, 80-95 coins should leave via sinks. What kind of game is this? The sink design depends heavily on game type.

It's a RPG with crafting, quests, and PvP. Players can trade items with each other.

Perfect! Player trading makes this MUCH more complex (and interesting). Here's your economic design: INJECTIONS (where coins come in): Quest rewards (fixed, controlled), PvP wins (need diminishing returns to prevent farming), Item sales to NPCs (price-controlled). SINKS (where coins go): Crafting fees (every craft consumes coins plus materials), Gear durability (repairs scale with item level), AH tax (5-10% fee on player trades - CRITICAL for economy control), Skill training (one-time costs that scale), Consumables (potions, food, ammo). The trading trap: Players will find the most efficient farming method and flood the economy. Countermeasures: Dynamic respawn rates on valuable mobs, Diminishing returns on repeated activities, Weekly and daily caps on high-reward content. Pro tip: Start with a DEFLATIONARY economy (more sinks than injections). It's easier to add coins later than to remove them. Want to dive into any specific system?