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Setting: The Central Politburo is the highest body of China’s government, and its jobs are highly popular. Ergo, the decision process is highly competitive and require more than a top performance in education and prior jobs. So, do friends in high positions help you get the job?

Idea: Protests often occur in response to economic shocks or unpleasant fiscal policies. However, protest organizers need to i) mobilize and ii) coordinate a large enough mass of people for a protest to take place – mobile phones are a huge help with both these tasks.
In the Shift-Share Design, we identify a causal effect via two components: An exogenous shock to all observations in our sample (the "Shift") combined with how much an observation is hit by that shock (the "Share").