Startups often fail not due to external competition, but because of internal issues. Estimates suggest that around 90% of startups eventually fail, and many of these failures stem from what Paul Graham calls "suicide" rather than "homicide." Founders may burn out or lose faith, leading to premature exits even when opportunities remain. Justin Kan observed that many startups implode before they exhaust all options, with internal conflicts, lack of traction, and team disagreements driving founders to give up too early. Y Combinator's Harj Taggar noted that successful startups are often those that persist despite challenges. Running out of money is a common symptom of failure, often cited as the second most common reason in startup post-mortems. However, this financial crisis usually results from deeper issues like failing to achieve product-market fit or mismanaging funds. Marc Andreessen emphasizes that a lack of market demand is the top killer of companies. Founders who quit when growth stalls often miss out on potential success. Those who manage to stretch their runway through patience and strategic pivots have a better chance of survival. Conflict among co-founders is another significant factor in startup failure, with research indicating that 65% of high-potential startups collapse due to interpersonal issues. Co-founder disagreements can hinder decision-making and damage company culture. Even losing a key founding member can destabilize a startup, creating a "single founder" problem where one person bears the burden alone. Furthermore, a loss of focus can derail a startup’s progress. Founders distracted by side projects or constantly changing strategies fail to maintain momentum, which can lead to loss of passion and ultimately, the company's downfall.