Research on City Commercial Complex Design Based on Externality Theory

Based on the cross study of externality theory of economics and city complex theory, with the city commercial complex as the research object, from the perspective of "externalities", we examine the due effects of commercial complex on urban space, function, environment, public culture and social economic activities. It is proposed to integrate commercial complex into urban planning and design system, focusing not only on land allocation and social economy, but also on user behavior and spatial landscape. By using "anti-commercial design thinking" and "public design thinking", a new design mode of externally optimized city commercial complex is established to eliminate negative externalities, increase positive externalities and play an important role in improving urban external quality.