How Video Game Economies Are Designed: How Taps, Drains, Convertors, and Traders Make Resources Flow

This analysis explores the fundamental architecture of video game economies, defining them as systems governing the flow of resources such as currency, experience points, and equipment. The central thesis posits that game economies are built upon five core entities—taps, inventories, converters, drains, and traders—which designers manipulate to shape player behavior, control progression pacing, and create strategic depth. By balancing these elements, developers can incentivize exploration, enforce difficult choices, or mitigate repetitive "grinding."

The framework identifies "taps" as sources that generate resources, such as loot drops or regenerating health, while "inventories" act as storage with limits that force prioritization. "Converters" allow players to exchange resources for power, such as spending gold for gear. To prevent infinite power scaling, designers utilize "drains," which permanently remove resources through mechanics like weapon durability or ammo consumption. Finally, "traders" introduce complexity by acting as independent agents with their own inventories, enabling market-based gameplay like arbitrage or risk-heavy investments.

The scope of this analysis is broad, applying these economic principles to diverse genres ranging from action RPGs like Elden Ring and The Witcher 3 to automation sims like Factorio. It highlights how specific design choices, such as using fewer currencies to increase the weight of spending decisions or implementing exponential cost curves, serve as negative feedback loops to maintain game balance. Ultimately, the findings suggest that while these systems are prone to exploits—illustrated by the "cow-killing" incident in The Witcher 3—a well-designed economy transforms simple resource management into a compelling engine for player engagement.