The endurance of empire in China over much of the past two millennia contrasts starkly with the political fragmentation in Europe since the fall of Rome. To explain the persistence of China’s empire, we analyze the role of keju, the imperial civil service examination system. We argue that the systematic implementation of keju from the Song dynasty onward tied local elites to the imperial state, sustaining political integration and reducing secessionist conflicts. Exploiting panel data covering 4,243 grid cells and 22 centuries, we find robust evidence that areas producing more jinshi – the top exam passers – experienced significantly fewer secessionist wars. Our study shows how the examination system created the political incentives for imperial durability.

We study the potential negative externalities of mandatory environmental, social, and governance (ESG) disclosure. Our analysis exploits a unique regulatory change in China that requires a subset of firms to report their contributions to poverty alleviation—on top of reporting general ESG issues—using a difference-in-differences design. We find that treated firms significantly increase their anti-poverty spending, but also increase their pollution, after the regulatory change came into force. The negative environmental externality is more concentrated in firms that are more financially constrained, as well as firms that are facing fiercer market competition. We further show that this effect is driven by a firm’s incentive to strategically cater to politicians’ agenda in order to obtain preferential treatment. These findings suggest that mandating ESG disclosure in selected areas may induce firms to trade off different ESG goals by prioritizing more conspicuous ESG issues at the cost of trivializing other, longer-term, issues.