Causal Inference out of Control: Estimating the Steerability of Consumption

• URL: http://arxiv.org/abs/2302.04989v1
• Date: Fri, 10 Feb 2023 00:27:48 GMT
• Title: Causal Inference out of Control: Estimating the Steerability of Consumption
• Authors: Gary Cheng, Moritz Hardt, Celestine Mendler-D\"unner
• Abstract summary: We introduce a general causal inference problem we call the steerability of consumption. Key novelty of our approach is to explicitly model the dynamics of consumption over time. Results illustrate the fruitful interplay of control theory and causal inference.
• Score: 22.365635918217674
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Regulators and academics are increasingly interested in the causal effect that algorithmic actions of a digital platform have on consumption. We introduce a general causal inference problem we call the steerability of consumption that abstracts many settings of interest. Focusing on observational designs and exploiting the structure of the problem, we exhibit a set of assumptions for causal identifiability that significantly weaken the often unrealistic overlap assumptions of standard designs. The key novelty of our approach is to explicitly model the dynamics of consumption over time, viewing the platform as a controller acting on a dynamical system. From this dynamical systems perspective, we are able to show that exogenous variation in consumption and appropriately responsive algorithmic control actions are sufficient for identifying steerability of consumption. Our results illustrate the fruitful interplay of control theory and causal inference, which we illustrate with examples from econometrics, macroeconomics, and machine learning.

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