The most significant mindset shift for founders is realizing they can't force a customer to have demand. Demand is an objective state in the customer's world—a project they are already trying to accomplish. This transforms sales calls from high-pressure convincing into low-pressure discovery, liberating the founder from feeling responsible for the outcome.

To escape the biased "supply lens," imagine viewing your potential customers as characters in the game SimCity. Observe their daily routines and workflows from a detached, third-person perspective, without your product existing in their world. This helps you identify genuine moments of struggle where they are blocked, rather than projecting problems your product could solve.

A common founder mistake is believing they must create demand for their new product. In reality, demand is an independent force—a person struggling to achieve something. Your job isn't to create this force, but to find where it's currently blocked and offer a solution that enables what already 'wants to happen'.

Founders mistakenly treat their product idea as fixed while searching for customers. The correct mindset is the reverse: customer needs are a fixed reality. Your product is the variable you must shape to fit that reality, not the other way around.

This reframes the fundamental goal of a startup away from a supply-side focus (building) to a demand-side focus (discovery). The market's unmet need is the force that pulls a company and its product into existence, not the other way around.

Operating with a "supply lens" creates a fantasy where customers, upon seeing your product, will magically alter their path to adopt it. The harsh reality is that if people aren't already struggling, your product is an irrelevant distraction. You're effectively shouting at passersby who are content on their journey and have no reason to listen.

Using a child's toy analogy, demand is a pre-existing hole (e.g., a star shape) and your product is the block. Founders fail when they build a block and then search for a hole it fits. The real job is to first deeply understand the shape of the hole, then craft a block that fits it perfectly.

The primary reason startups stall is a misunderstanding of buyer psychology. Founders assume purchases are driven by pain points, problems, and product value. In reality, the decision to buy is often disconnected from these 'things.' Shifting focus from what the product is to what triggers a purchase is the key to unlocking growth.

When customers use your product in surprising ways, don't just build features for the new use case. Apply the "demand lens" by rewinding time. Investigate what struggle or "pull" existed in their world *before* they discovered your product to understand the core, pre-existing demand that is driving their behavior.