This analysis examines the economic systems of four popular games Clash of Clans, CS: GO, Dota 2, and Hay Day, highlighting different approaches to resource management, earning mechanisms, and progression loops. The study identifies three core components of in-game economies: earning methods, resource usage, and progression structures. Clash of Clans and Hay Day focus on long-term progression, encouraging sustained engagement through gradual resource accumulation and strategic upgrades. In contrast, CS: GO and Dota 2 rely on short-term tactical economies where rapid decision-making and adaptive spending directly affect gameplay outcomes. Games such as Dota 2 also employ dynamic reward scaling to maintain engagement across skill levels. From a design perspective, the findings suggest that balanced economic systems enhance retention by supporting diverse playstyles. Long-term reward structures sustain player interest, while tactical economies promote adaptability. The study concludes that thoughtful economic design is essential for meaningful player engagement and progression.