Convexity and sunspots: A remark
指出，在竞争均衡配置最优且个人偏好严格凸的经济中，即使生产存在非凸性，经济也不会受太阳黑子影响。
Economies in which competitive equilibrium allocations are optimal and individual preferences are strictly convex are immune to sunspots; this is so even in the presence of non-convexities in production.