When an app becomes a daily necessity, users are less sensitive to price changes or subscription fees.
To increase the likelihood of an action, increase motivation OR increase ability. Often, making the action easier (higher ability) is more powerful than increasing motivation.
The ultimate goal of the Investment phase is to set up the next , re-initiating the loop. For instance, sending a message on WhatsApp (Investment) prompts a reply from a friend, which lands on your screen as a push notification (Trigger). The Manipulation Matrix: The Ethics of Habit Formation
The Investment phase leverages a cognitive bias known as the (or the "IKEA effect"): the more work we put into something, the more we value it. Investments make the product better for the user over time, creating a customized experience that makes leaving difficult. Examples include: Building a follower list on Spotify or Twitter. Accruing history and data in an accounting software. hooked how to build habit-forming products by nir eyal pdf
Habits need a starting point. Eyal categorizes triggers into two main types:
The search for information or resources (scrolling a newsfeed).
The final phase of the Hook Model is where the user puts something back into the product. Unlike the action phase, which offers immediate gratification, the investment phase builds anticipation for future rewards. When an app becomes a daily necessity, users
| Product | Trigger | Action | Variable Reward | Investment | | :--- | :--- | :--- | :--- | :--- | | | Loneliness / Boredom | Scroll News Feed | Tribe (likes, comments, drama) | Posting, friending, liking | | Pinterest | Aspiration / Boredom | Pin a photo | Hunt (beautiful new images) | Creating boards, repinning | | Slack | Work anxiety / FOMO | Check channel | Tribe (team recognition, emoji reactions) | Sending messages, adding integrations | | Twitter | Uncertainty / Boredom | Scroll / Tweet | Tribe (retweets, quote tweets) | Following accounts, building timeline | | Pokémon Go | Boredom / Proximity | Walk to a PokeStop | Hunt (rare Pokémon, items) | Catching, evolving, gym battles |
Investment increases the value of the product for the user's next visit. It loads the next trigger, making it more likely the user will repeat the cycle. For example, building a playlist on Spotify or adding skills to a LinkedIn profile makes it harder for the user to switch to a competitor. Why Product Managers Seek the "Hooked" PDF and Framework
[1. Trigger] ---> [2. Action] ^ | | v [4. Investment] <--- [3. Variable Reward] 1. Triggers (The Spark) The ultimate goal of the Investment phase is
This article explores the core concepts of the Hooked Model, summarizing how you can create habit-forming technologies that "manufacture desire" and build long-term user engagement. What is the "Hooked" Model?
Minimize clicks, scrolls, and decisions required to get to the core value of your product.
: The creator uses the product but admits it does not substantially improve lives (e.g., casual mobile games). These products often suffer from short lifespans as users move on to the next trend.
You create a product that you use and that genuinely helps others (e.g., educational tools, health tracking apps). This is the highest ethical standard.
In this phase, the key is to make the action as easy as possible. The principle is to minimize friction. Eyal advises designers to ask: "Can a tired, distracted, mildly motivated user complete this action in under five seconds?" Successful products reduce steps, remove form fields, and eliminate unnecessary confirmation dialogs to make the desired action almost effortless. For instance, the action on Pinterest is simply scrolling through an endless feed, and on TikTok, it is an infinite autoplay of videos.