Echoing Warren Buffett, investor Mike Schrepper advises that market dynamics—whether it's growing, shrinking, or has concentrated buyers—are the dominant factor in a company's success. Even an exceptional entrepreneur cannot overcome a fundamentally bad market, whose reputation will ultimately prevail over the founder's talent.

Entrepreneurs who thrived during past downturns (like 2008) often become complacent. With higher overhead and a more comfortable lifestyle, they are less willing to do the hard, uncomfortable work required to win in a new down market, creating an opportunity for hungrier competitors.

In a rising market, the investors taking the most risk generate the highest returns, making them appear brilliant. However, this same aggression ensures they will be hurt the most when the market turns. This dynamic creates a powerful incentive to increase risk-taking, often just before a downturn.

A long bull market can produce a generation of venture capitalists who have never experienced a downturn. This lack of cyclical perspective leads to flawed investment heuristics, such as ignoring valuation discipline, which are then painfully corrected when the market inevitably turns.

The best time to launch a company is at the bottom of a recession. Key inputs like talent and real estate are cheap, which enforces extreme financial discipline. If a business can survive this environment, it emerges as a lean, resilient "fighting machine" perfectly positioned to capture upside when the market recovers.

Founders who succeed by randomly trying ideas rather than using a systematic process don't learn repeatable skills. This lucky break can be detrimental, as it validates a flawed strategy and prevents the founder from learning the principles needed for consistent, future success.

Resilience is not a learned trait for entrepreneurs but a fundamental prerequisite for survival. If you are still in business, you have already demonstrated it. The nature of entrepreneurship, where the 'buck stops with you,' naturally selects for those who are resilient and adaptable.

Prosperity breeds complacency, leading businesses to overspend and expand into non-core areas. This dilutes focus and creates vulnerabilities. In contrast, bad times force the discipline and process improvements that build resilient companies, exposing what's missing in the operation.

A rising tide lifts all boats. The true test of a founder partnership emerges during downturns. Diligence should focus on teasing out traits like adaptability, humility, and accountability, which predict how a founder will react when plans inevitably go awry.