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Optimal Taxation and Market Power

By Jan Eeckhout, Chunyang Fu, Wenjian Li, and Xi Weng

American Economic Review, January 2026

Should optimal income taxation change when firms have market power? We analyze how the planner can optimally tax labor income of workers and profits of entrepreneurs. We derive optimal tax rates that depend on markups and identify four distinct components...

Tying with Network Effects

By Jay Pil Choi, Doh-Shin Jeon, and Michael D. Whinston

American Economic Review, January 2026

We develop a leverage theory of tying in markets with network effects. When a monopolist in one market cannot perfectly extract surplus from consumers, tying can be a mechanism through which unexploited consumer surplus is used as a demand-side leverage t...