This article presents a qualitative empirical study of the impact of corruption and anti-corruption on the efficiency of China's bureaucratic system in developing a local economy. Drawing on 40 in-depth interviews and 98 days of participant observation, it first investigates the significance of extravagant position-related consumption in building personalized bureaucratic ties (patronage networks) and mobilizing resources for local economic development. It then examines the causal link between President Xi's campaign against corruption and extravagance and the rise of bureaucratic slack in local governments. The anti-extravagance campaign reduces the level of corruption in local government but it discourages local officials, who are motivated primarily by the desire to avoid risk and ensure political survival, from using banquets and gift-giving to build patronage networks, attract investment and mobilize development resources. The article concludes that corruption may contribute positively to the efficiency of a fragmented Chinese bureaucracy in fostering development at the local level, while the anti-corruption campaign compels local cadres to develop a new coping strategy – bureaucratic slack – for implementing policies and developing local economies.