本文以 2010 年至 2024 年美國上市公司為樣本，結合 DEF 14A、BoardEx、COMPUSTAT、CRSP 與專利資料，建構動態家族企業辨識指標，系統性檢驗家族企業與非家族企業在會計績效、市場評價、代理成本、風險、創新成果及股票報酬上的差異。本文旨在釐清家族控制是否會在公司治理與企業經濟後果上產生具系統性的影響。
研究結果顯示，家族企業在資本市場上享有較高評價，反映投資人平均而言給予其較高的市場價格；同時，家族企業在利潤率與營業利益率上也有較佳表現，顯示其銷售獲利能力較強，但在 ROA 指標上並未展現穩定優勢。在代理成本與財務政策方面，家族企業僅於部分費用控制指標上呈現較佳結果，並未在所有相關面向上皆出現一致差異。另一方面，家族企業之總風險與特有風險皆較高，且在專利數量與專利價值上表現較佳；在股票報酬方面，正向異常報酬（alpha）主要出現在價值加權投資組合。
本文結果顯示，家族企業的優勢並非全面反映於所有短期財務績效指標，而是較多體現在市場評價、創新表現與部分長期價值面向。就整體圖像而言，家族企業較適合被理解為一種願意承擔較高風險，以換取長期價值創造與創新機會的治理型態。

This study uses U.S. listed firms from 2010 to 2024 and combines DEF 14A proxy filings, BoardEx, COMPUSTAT, CRSP, and patent data to construct a dynamic family-firm indicator. It systematically examines whether family firms differ from non-family firms in accounting performance, market valuation, agency costs, risk, innovation outcomes, and stock returns. The purpose is to clarify whether family control generates systematic effects on corporate governance and economic outcomes.
The results show that family firms receive higher market valuations, in-dicating that investors on average assign them higher market prices. Family firms also exhibit stronger profit and operating margins, suggesting better sales-based profitability, but they do not show a robust advantage in ROA. Evidence on agency costs and financial policy is limited, as family firms appear to be more efficient only in some expense-control measures rather than across all related dimensions. At the same time, family firms exhibit higher total and idiosyncratic risk, as well as stronger patent quantity and patent value. In the stock return analysis, positive alpha appears mainly in value- weighted portfolios.
Overall, the findings suggest that the advantages of family firms are not uniformly reflected in all short-term accounting measures. Instead, they are more evident in market valuation, innovation, and selected long-term value dimensions. Family firms are therefore better understood as a governance form that accepts higher risk in exchange for long-term value creation and innovation opportunities.

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