北京市西城區是一個老字號資源十分豐富的地區，老字號是西城區濃厚歷史文化根基上的一脈。由於老字號在西城區的經濟比重較低，因此衡量老字號經濟價值，更側重其向社會「溢出」的價值。本文依據「公共物品」和「外部性」理論，採用支付意願調查法，探索分析老字號對社會提供的經營目的之外的價值，並分析了這些「外溢價值」在空間上的分佈。在此分析基礎上，本文建議城市規劃要全盤考慮保護和發展老字號的空間佈局，利用規劃，推動老字號延伸產業鏈，實現集群發展，更好地發揮老字號在城市發展中的作用、在企業轉型中的品牌引領作用，以及在產業鏈延伸中的核心拉動作用。
There are many time-honored firms in Xicheng District, Beijing. These old firms bring a strong sense of history and culture to Xicheng District. Because of their low proportion of the economy in Xicheng District, the measurement of time-honored firms' economic value is more focused on their 「overflow」 values to the whole society. Based on public goods and externalities theory, this essay analyzes the spillover values provided by those old firms beyond their business purposes and the spatial distribution of these values. This paper also uses willingness-to-pay survey to reflect people's views on the time-honored firms. From the geographic perspective, this article provides suggestion that urban planning should take the protection and development of time-honored firms' spatial layout into overall consideration, and meanwhile promote time-honored firms to extend their industrial chains to achieve cluster development by planning. Long-term goal of these measures is to better play time-honored firms' central leading role in regional development, business transformation and industry chain extension.
