Companies prioritize culture because it directly impacts performance and employee behavior. The piece explores a hypothetical scenario where hiring decisions are completely decentralized, revealing that such an approach feels wrong to most founders. This discomfort stems from the understanding that a firm's culture influences employee interactions and overall productivity. The author cites Ronald Coase's theory, which states that firms exist primarily to reduce transaction costs associated with hiring external parties. Full-time employees are often hired not just for their skills but also because they need specific context to create value, which can be too costly or complex to share externally. The author highlights the phenomenon of "shirking," where employees may reduce effort when their contributions aren’t easily measurable. This behavior can be exacerbated by corporate structures that reward short-term gains over long-term health, leading to a disconnect between individual incentives and the company’s goals. The piece argues that culture serves to align these interests by fostering a sense of shared purpose. Strong cultures often thrive in founder-led companies, where the founder's vision becomes a driving force. Leaders who embody their company's values and make sacrifices for the collective well-being inspire similar loyalty from employees, creating a self-reinforcing cycle. Effective cultures are built on specific ideals or narratives rather than vague platitudes. For instance, the author mentions Bridgewater's focus on truth-seeking as a guiding principle. These ideals must be demanding enough to discourage free-riding and maintain a strong identity. When leaders demonstrate commitment to the culture—like turning down lucrative deals for the sake of principles—they encourage reciprocal loyalty from employees. This mutual reinforcement helps maintain a vibrant culture that thrives beyond the founder’s direct oversight, ensuring that employees feel accountable to one another.