Revisiting the Impact of Upstream Mergers with Downstream Complements and Substitutes

2024-02-19

AI Summary

This paper examines how upstream firm mergers affect bargaining prices set by a monopolistic intermediary. Conventional wisdom holds that product complementarity or substitutability on the consumer side directly determines bargaining outcomes: complements depress, while substitutes elevate, upstream prices. Using game-theoretic and bilateral bargaining models, we demonstrate that when the intermediary’s sales portfolio extends beyond the merged firms’ product scope, the perceived inter-product relationship reverses—consumer complements become substitutes (and vice versa) from the intermediary’s strategic perspective. This mechanism implies that non-exclusive, non-monopolistic upstream mergers can still raise buyer-specific prices, challenging the hypothesis of direct demand-relationship transmission. Our analysis provides a novel theoretical foundation for understanding post-merger price discrimination and offers implications for antitrust policy evaluation, particularly regarding vertical foreclosure and bargaining power asymmetries.

Technology Category

• Game Theory and Economic Paradigms: Mechanism Design
• Multiagent Systems: Mechanism Design
• Knowledge Representation and Reasoning: Nonmonotonic Reasoning

Application Category

• Economics, Online Markets and Human Computation: Advertising auctions, pricing, markets, and exchanges
• Semantics and Knowledge: Methods to enhance, augment, integrate or synergize semantic models such as knowledge graphs and LLMs
• Graph Algorithms and Modeling for the Web: Efficient manipulation of static and dynamic Web-related graphs

Abstract

I examine how upstream mergers affect negotiated prices when suppliers bargain with a monopoly intermediary selling products to final consumers. Conventional wisdom holds that such transactions lower negotiated prices when the products are complements for consumers and raise them when they are substitutes. The idea is that consumer demand relationships carry over to upstream negotiations, where mergers between complements weaken the suppliers' bargaining leverage, while mergers between substitutes strengthen it. I challenge this view, showing that it breaks down when the intermediary sells products beyond those of the merging suppliers. In such cases, the merging suppliers' products may act as substitutes for the intermediary even if they are complements for consumers, or as complements for the intermediary even if they are substitutes for consumers. These findings show that upstream conglomerate mergers can raise prices without foreclosure or monopolization and help explain buyer-specific price effects resulting from such mergers.

Problem

• Examines how upstream mergers affect negotiated prices with intermediaries
• Challenges conventional wisdom on price effects of complements and substitutes
• Shows mergers can raise prices without monopolization or foreclosure

Innovation

• Challenges conventional wisdom on upstream mergers
• Links consumer demand to intermediary product relationships
• Explains price effects without foreclosure or monopolization