How the Addiction Model Fuels Habit‑Forming Products – A Deep Dive
This article explains the four‑stage addiction model—trigger, action, variable reward, and investment—showing how it shapes habit‑forming products and illustrating its application with a detailed analysis of the game Animal Crossing: New Horizons.
What Is the Addiction Model?
The addiction (or habit) model consists of four parts—trigger, action, reward, and investment—and helps designers create products that encourage repeat usage.
Four Steps of the Model
Trigger : a cue that reminds users to take the next step.
Action : a simple behavior; the B=MAT formula (Behavior = Motivation × Ability × Trigger) shows that sufficient motivation, ability, and a trigger are required.
Variable Reward : rewards that satisfy user needs and keep them engaged. They fall into three categories:
Social reward – interpersonal benefits from interacting with others.
Treasure reward – concrete resources or information gained.
Self reward – feelings of control, achievement, or completion.
Investment : user effort or resources put into the product, creating a sunk‑cost effect that encourages continued use.
Product Analysis: Animal Crossing: New Horizons
Since the pandemic, the game "Animal Crossing: New Horizons" ("动森") has become a cultural phenomenon, turning casual curiosity into deep engagement.
Trigger : external cues such as social sharing and word‑of‑mouth, plus internal cues like the desire to showcase a personalized island.
Action : purchasing a Switch, buying the game, creating a unique avatar and island name, and completing quests and achievements that drive ongoing play.
Variable Reward :
Social reward – inviting friends to visit islands, exchanging items.
Treasure reward – expanding house size, acquiring rare items, earning in‑game currency.
Self reward – personal achievement, sharing screenshots, and expressing creativity.
Investment : players invest time building their islands, inviting more friends, and sharing their progress, which deepens attachment and restarts the addiction loop.
Conclusion
Designing a successful product requires more than appealing visuals and interactions; it demands a solid theoretical foundation—such as the addiction model—to shape user habits and sustain long‑term engagement.
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