Develop a causal inference approach to determine the effect of remote working on employee efficiency.
Instruction: Propose a methodology that accounts for both observed and unobserved confounders.
Context: The question aims to examine the candidate's capability in designing a causal study that includes handling complex scenarios like unobserved heterogeneity.
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To start, let's clarify our primary objective: we aim to infer the causal effect of remote working on employee efficiency...