Earned through gameplay

1. Virtual Items vs In-Game Items (Gamification Achievement Systems Tips)
2. In-Game Currency vs Premium Currency (Player-Centric Gamification Tips)
3. Premium Currency vs Free Currency (Virtual Economy Gamification Tips)
4. Subscription Model vs Freemium Model (Player-Centric Gamification Tips)
5. Capital vs Resources (Virtual Economy Gamification Tips)
6. Virtual Property vs Physical Property (Virtual Economy Gamification Tips)
7. Virtual Goods vs Digital Goods (Player-Centric Gamification Tips)
8. Virtual Budget vs Game Budget (Virtual Economy Gamification Tips)
9. Player Economy vs Developer Economy (Virtual Economy Gamification Tips)
10. Market Economy vs Virtual Economy (Virtual Economy Gamification Tips)
11. Game Scenario vs Player Scenario (Gamification Player Progression Tips)
12. Game Rewards vs Game Bonuses (Gamification Achievement Systems Tips)
13. Gameplay Elements vs Game Features (Gamification Achievement Systems Tips)
14. Economic Impact vs Game Impact (Virtual Economy Gamification Tips)
15. Economic Environment vs Virtual Environment (Virtual Economy Gamification Tips)
16. Virtual Store vs In-Game Store (Virtual Economy Gamification Tips)
17. Virtual Trade vs Digital Trade (Virtual Economy Gamification Tips)