The arrival of the digital platform for buying and selling goods is altering the nature of markets by creating enormous economies of scale and enabling firms to reach purchasers far and wide. Further, digital platforms, especially when they are themselves profit-making firms, give rise to new...

The digital revolution, along with the growth of the companies known collectively as Big Tech, is transforming the global economy and giving rise to novel policy challenges. This paper analyzes the microeconomic foundations of this change, particularly how the natures of competition and...