A good transaction is arbitrage, which is a firm belief in one's trading model. The money is right there, in one's strike zone, just waiting to be picked up. A good business meets the condition of having a high enough ceiling, aligns with trends, and can accommodate more talent and capital. More critically, the business model must have decreasing or even zero marginal costs during the scaling process, making it the most antifragile. For example, <樊登读书>, with only 100 people in the team including technical staff, the rest are agents, selling millions of membership cards annually. A bad business is one where marginal costs do not decrease during scaling. While it may seem scalable, it could collapse at the slightest disturbance. A good business model stands on the side of time, becoming time's friend, with increasing effectiveness over time, allowing the growth flywheel to start spinning. For instance, doing is a zero marginal cost model, which for individuals, is the best business.

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