Networks, Platforms, and the Economics of “Free Goods”

Overview of Network Goods and Platforms

Network goods and platform firms play a significant role in modern markets, often shaping competition and consumer welfare. These goods are typically supplied by monopolies or oligopolies, and the dynamics of competition differ from traditional markets.

• Network goods are usually produced by monopolies or oligopolies due to strong network effects.

• Competition is often “for the market” (winner-takes-all) rather than “in the market” (ongoing rivalry).

• The best product does not always win; market outcomes can be sub-optimal.

• Contestability—the ease with which new firms can enter and challenge incumbents—matters for market outcomes.

• Platform firms connect two sides of a market, maximizing transaction value by lowering costs and increasing the number of transactions.

• Providing free products to one side of the market can be a profit-maximizing strategy for platforms.

Network Goods: Definition and Examples

A network good is a product whose value to each user increases as more people use it. This phenomenon is known as a network externality, specifically a positive externality.

• Definition: A good whose value to one customer increases the more that other customers use the good.

• Examples:

  • Telephones

  • Social Media platforms (e.g., Facebook, TikTok)

  • Microsoft Word

  • Electric Cars (charging infrastructure)

  • Online Gaming Sites (e.g., Chess.com)

• Network externality: The effect whereby increased usage of a good by others increases its value for each user.

Example: Chess.com becomes more valuable as more players join, increasing the pool of potential opponents and community features.

Identifying Network Goods

Not all goods are network goods. The defining feature is that the value to each user increases with the number of users.

• Network goods: TikTok, Massively Multiplayer Online Games, eBay

• Not a network good: Bugatti Chiron Automobile (value does not depend on number of users)

Music as a Network Good

Social influence can create network effects in markets for goods like music. Experiments show that popularity can be self-reinforcing.

• Experiment by Duncan J. Watts: Demonstrated that the more downloads a song had, the more people wanted to download it, showing a strong social component in music preferences.

Example: Viral songs on streaming platforms often become more popular simply because many others have already downloaded them.

Monopolies, Oligopolies, and Network Goods

Due to network externalities, network goods markets tend to be dominated by a single firm or a few large firms.

• Examples: Software (Windows, Word, Excel), Social Media (Facebook, Instagram), Dating Sites (Match, Tinder), Hardware Standards (Wireless charging, Railroad gauge)

• Smaller firms may exist, serving niche markets.

Competition: For the Market vs. In the Market

In network goods markets, firms compete to become the dominant standard, rather than through ongoing rivalry.

• Standard Wars: Sometimes the adopted standard is not the best available (e.g., Betamax vs. VHS, Blu-ray vs. HD DVD).

• Sub-optimal equilibrium: Market may settle on a product that is not technically superior due to network effects and early adoption.

Game Theory and Nash Equilibrium in Network Goods

Game theory helps explain strategic choices in network goods markets, especially when coordination is required.

• Payoff Matrix: Used to analyze choices between competing standards (e.g., Microsoft Word vs. Google Docs).

• Nash Equilibrium: A situation where no player has an incentive to change their strategy unilaterally.

Example Payoff Matrix:

Both (Docs, Docs) and (Word, Word) are Nash equilibria; either standard can be sustainable if both users coordinate.

Contestability in Network Goods Markets

Contestability refers to how easily new competitors can enter and challenge incumbents in a market.

• High contestability: Low fixed costs, few legal barriers, no unique resources, and consumers willing to try new products.

• Low contestability: High switching costs, strong consumer loyalty, or unique resources held by incumbents.

• Examples of contestable markets: Spreadsheet and word processing software (e.g., Lotus 1-2-3 vs. Excel), Learning management systems (Blackboard vs. Canvas).

Platform Firms and Two-Sided Markets

Platform firms facilitate transactions between two or more distinct user groups, often by reducing transaction costs and leveraging network effects.

• Examples: Facebook, Uber, eBay, OkCupid, Broadcast TV, Newspapers, Credit Cards

• Profit is made by taking a cut of the value generated by connections.

• Platforms may set a price of zero for one side of the market to maximize participation and cross-side network externalities.

Example: Facebook does not charge users but charges advertisers, because advertisers benefit more from a larger user base.

Government Policy and Network Goods

Regulation of network goods and platform firms is complex due to their market power and influence.

• Antitrust issues: Legal cases against firms like Google and Amazon for alleged monopolistic practices.

• Platform policies can sometimes rival government regulations in impact (e.g., free speech debates, discrimination issues).

Summary Table: Features of Network Goods Markets

Key Terms and Concepts

• Network Good: A product whose value increases as more people use it.

• Network Externality: The effect of one user's consumption on the value of the good to others.

• Platform Firm: A company that connects two or more sides of a market.

• Contestability: The degree to which a market can be challenged by new entrants.

• Nash Equilibrium: A game theory concept where no player can benefit by changing strategies unilaterally.

Relevant Equations

• Network Externality Value: If is the value to a user when users are in the network, then for a network good.

• Nash Equilibrium Condition: For strategies and , is a Nash equilibrium if and for all .

Additional info: These notes expand on the original slides by providing definitions, examples, and academic context for network goods, platform firms, contestability, and game theory concepts relevant to microeconomics.