Game Economy Design Basics: Sources, Sinks and Inflation
How game economies work: sources and sinks, hard and soft currencies, the metrics to watch and how to fix inflation and grind walls.
By Sam Porter Miller · · 5 min read
Many games have economies: coins, gems, crafting materials, energy, loot. A healthy economy keeps progress satisfying for months. A broken one creates inflation, boredom or frustration. Here are the basics designers and analysts use.
Sources and sinks
Every economy has two sides:
- Sources create currency or items: quest rewards, enemy drops, daily login bonuses, purchases.
- Sinks remove them: upgrades, repairs, crafting, cosmetics, fees, consumables.
If sources outpace sinks, players pile up resources and prices lose meaning: inflation. If sinks outpace sources, progress feels slow and grindy.
Hard and soft currencies
| Type | Typical source | Typical use |
|---|---|---|
| Soft currency | Earned through play | Everyday upgrades and items |
| Hard (premium) currency | Bought, sometimes earned slowly | Cosmetics, time-savers, special items |
| Materials | Drops, crafting, events | Crafting and progression gates |
Clear separation helps players understand value and helps designers balance each layer.
Key metrics to watch
- Currency earned vs spent per player per day. The core balance check.
- Median balance by level or day. Rising balances can signal missing sinks.
- Time to reach key upgrades. Shows pacing.
- Item price trends in player-driven markets.
- Spend distribution. How many players buy anything, and how spend is distributed.
Use medians as well as averages: a few very rich players can make averages misleading.
Common problems and fixes
- Inflation: add meaningful sinks (cosmetics, upgrades, maintenance) or reduce oversized sources.
- Hoarding: players save everything for the "best" item. Add items with value at every stage.
- Grind walls: a sudden jump in cost causes churn. Smooth the curve or add alternative sources.
- Exploits: an unexpected infinite source can wreck an economy fast. Monitor sudden spikes in earnings.
Designing for fairness
Players notice when an economy feels designed to pressure them. Transparent prices, clear odds where randomness is involved, and progress that respects players' time build trust, and trust keeps players around.
A simple monitoring routine
- Track daily sources and sinks for each currency.
- Watch median balances by player cohort.
- Review new content for its effect on both sides before release.
- Investigate any spike or drop quickly.
Economies are living systems. Balance them like a garden: small, regular adjustments beat drastic changes.
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