Industrial Economics and Network Economics

In a monopoly, a single seller controls the entire market, eliminating competition and allowing the seller to set prices and output levels.

The Nash equilibrium is a set of strategies in a game where no player can improve their outcome by unilaterally changing their strategy, assuming the other players' strategies remain unchanged.

Externalities are the costs or benefits of production or consumption that are imposed on or received by third parties, who are not directly involved in the transaction.

Network effects occur when the value of a good or service increases as more people use it, creating a positive feedback loop that can lead to rapid growth and dominance in the market.

Natural monopolies occur when a single producer can supply the entire market at a lower cost than multiple producers, making competition inefficient. A local water utility is an example of a natural monopoly due to the high fixed costs of infrastructure and the economies of scale involved in water distribution.

Price discrimination occurs when a seller charges different prices to different consumers for the same good or service, based on factors such as their willingness to pay, location, or time of purchase.

A two-sided market is a market where buyers and sellers interact through a platform, such as an online marketplace or a social media platform, which facilitates the exchange of goods or services.

Ride-sharing platforms, such as Uber and Lyft, are examples of two-sided markets, where the platform connects drivers and riders, facilitating the exchange of transportation services.

Economies of scale occur when a firm experiences a decrease in average cost as its output increases, due to factors such as specialization, division of labor, and technological improvements.

Education is an example of a positive externality, as it benefits not only the individual receiving the education but also society as a whole, through increased productivity, innovation, and social cohesion.

Market power refers to the ability of a firm to influence the price of a good or service in the market, set prices above marginal cost, and prevent entry of new competitors into the market.

Pollution from a factory is an example of a negative externality, as it imposes costs on society, such as health problems and environmental damage, that are not borne by the factory itself.

Cournot competition is a model of oligopolistic competition where firms compete in quantity, assuming that each firm's output decision is based on the expected output of its competitors.

National defense is an example of a public good, as it is non-excludable (once provided, it is impossible to exclude anyone from consuming it) and non-rivalrous (one person's consumption does not diminish the availability of the good for others).

Bertrand competition is a model of oligopolistic competition where firms compete in price, assuming that each firm's price decision is based on the expected prices of its competitors.