The combined diversification breadth and mode dimensions and the performance of large diversified firms
研究了多元化广度（相关/不相关）与模式（内部/外部）的共生关系对企业绩效的影响，发现相关多元化组合绩效较高，而不相关外部组合绩效最差。
Abstract This paper examines the impact of the symbiotic relationship between diversification breadth and mode on firm performance. Seventy‐three Fortune 500 firms were classified by diversification breadth (related/unrelated) and mode (internal/external) and their performance during the period 1975–84 analyzed on four financial performance measures. The two related categories (related‐internal/related‐external) were generally higher performers than the two unrelated categories (unrelated‐internal/unrelated‐external) as hypothesized, but the differences were not significant on most performance measures. The unrelated‐external category appears to be the worst performer, which presents a dilema since this strategy has dominated the conglomerate movement.