Freemium business model

1. Virtual Goods vs Digital Goods (Virtual Economy Gamification Tips)
2. Game Economy vs Virtual Economy (Virtual Economy Gamification Tips)
3. In-Game Purchases vs Microtransactions (Player-Centric Gamification Tips)
4. Monetization Strategy vs Revenue Model (Virtual Economy Gamification Tips)
5. Payment Systems vs Billing Systems (Virtual Economy Gamification Tips)
6. Economic Trends vs Game Trends (Virtual Economy Gamification Tips)
7. Market Demand vs Player Demand (Virtual Economy Gamification Tips)
8. Market Pricing vs Fixed Pricing (Virtual Economy Gamification Tips)
9. Virtual Currency vs Real Currency (Virtual Economy Gamification Tips)