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Documents de travail du Département des Affaires économiques de l'OCDE

Documents de travail du Département des affaires économiques de l’OCDE recouvrant toutes les activités de ce département : conjoncture économique, analyse politique et projections ; politique fiscale, dépenses publiques et fiscalité ; questions structurelles dont le vieillissement, la croissance et la productivité, la migration, l’environnement, le capital humain, le logement, les échanges et les investissements, les marchés de l’emploi, la réforme réglementaire, la concurrence, la santé et d’autres thèmes.

English, French

Tracking activity in real time with Google Trends

This paper introduces the OECD Weekly Tracker of economic activity for 46 OECD and G20 countries using Google Trends search data. The Tracker performs well in pseudo-real time simulations including around the COVID-19 crisis. The underlying model adds to the previous Google Trends literature in two respects: (1) the data are adjusted for common long-term bias and (2) the data include variables based on both Google Search categories and topics (the latter being a collection of related keywords), thus further exploiting the potential of Google Trends. The paper highlights the predictive power of specific topics, including "bankruptcies", "economic crisis", "investment", "luggage" and "mortgage". Calibration is performed using a neural network that captures non-linear patterns, which are shown to be consistent with economic intuition using machine learning interpretability tools ("Shapley values"). The tracker sheds light on the recent downturn and the dynamics of the rebound, and provides evidence about lasting shifts in consumption patterns.

English

Keywords: Google Trends, machine learning, COVID-19, high-frequency, interpretability, nowcasting
JEL: C53: Mathematical and Quantitative Methods / Econometric Modeling / Forecasting and Prediction Methods; Simulation Methods; E37: Macroeconomics and Monetary Economics / Prices, Business Fluctuations, and Cycles / Prices, Business Fluctuations, and Cycles: Forecasting and Simulation: Models and Applications; C45: Mathematical and Quantitative Methods / Econometric and Statistical Methods: Special Topics / Neural Networks and Related Topics; C55: Mathematical and Quantitative Methods / Econometric Modeling / Large Data Sets: Modeling and Analysis
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