People’s entrepreneurial intention and action largely depend on their development and acquisition of entrepreneurial capital, including human, social, and financial capital. Extant research has adopted an intergenerational perspective, emphasizing that entrepreneurial capital can be transferred from parents and grandparents to offspring. We advance this literature by introducing an intragenerational perspective and arguing that siblings affect one’s development and acquisition of entrepreneurial capital. Siblings enhance social capital development through mutual learning, hinder human capital development because parental resource dilution harms cognitive advancement, and facilitate financial capital acquisition via lending and co-funding. In combination, these effects result in an inverted U-shaped relationship between sibship size and entrepreneurial intention and a positive and concave relationship between sibship size and entrepreneurial action. We also argue that men obtain more combined entrepreneurial capital from siblings than do women due to their parents’ son preference, shifting the inflection points of these curved relationships to the right for men. We analyze data on 6,048 individuals (16–60 years old) and find general evidence for these notions.

人们的创业意愿和创业行动在很大程度上取决于他们对创业资本的开发和获取，包括人力资本、社会资本和金融资本。现有研究采用代际视角，强调创业资本可以从父母和祖父母转移给后代。我们通过引入代内观点并论证兄弟姐妹影响一个人的发展和创业资本的获取来推进这一文献。兄弟姐妹通过相互学习促进社会资本发展，阻碍人力资本发展，因为父母资源稀释不利于认知进步，并通过借贷和共同资助促进金融资本获取。结合，这些影响导致同胞规模与创业意向之间呈倒U型关系，同胞规模与创业行为之间呈正凹关系。我们还认为，由于父母的儿子偏好，男性比女性从兄弟姐妹那里获得了更多的联合创业资本，从而将这些弯曲关系的拐点转移到男性的权利。我们分析了 6,048 人（16-60 岁）的数据，并找到了支持这些观点的一般证据。