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Humans have been creating and using algorithms for thousands of years, but never before have the effects of algorithms been so pervasive in our everyday lives and the functioning of the economy as a whole. Recent developments in technologies relating to computer processing power, data storage, and artificial intelligence have enabled the adoption of increasingly sophisticated algorithms that are reshaping competitive landscapes across industries, raising many new questions about competition and antitrust in the process. This article focuses on three areas of antitrust where the use of algorithms has drawn scrutiny from both enforcers and practitioners from around the globe : collusion, mergers, and algorithm self-preferencing.