A monopoly exists when a single seller dominates the market. By controlling the total supply of a unique product, the monopolist gains significant power to influence and set the price level, as there are no close substitutes available for consumers.

National security is a classic example of a public good, characterized by non-excludability and non-rivalry. Because individuals cannot be excluded from the benefits of national defense, private firms have little incentive to provide it, as they cannot easily charge users. Therefore, the government typically provides such services to ensure collective safety and stability.

In perfect competition, firms earn normal profits in the long run. Since normal profit is included in the cost structure, the equilibrium price must equal the minimum point of the Long-Run Average Cost (LAC) curve. If the price were higher, new firms would enter; if lower, firms would exit.

In perfect competition, long-run equilibrium occurs where the firm produces at the minimum point of its long-run average cost curve. At this point, price equals marginal cost and average cost. This ensures that the firm is making zero economic profit (normal profit) and is operating at maximum productive efficiency.

A monopolist practicing price discrimination maximizes total profit by allocating output such that the marginal revenue (MR) in each market is equal to the marginal cost (MC) of production. If MR differed between markets, the firm could increase profit by shifting sales from the market with lower MR to the one with higher MR until equality is reached.

In a perfectly competitive product market, the price of the product is equal to the marginal revenue (MR = P). Since VMP is defined as Marginal Physical Product multiplied by Price, and MRP is defined as Marginal Physical Product multiplied by Marginal Revenue, the equality holds true. Therefore, under perfect competition, the value of the marginal product is identical to the marginal revenue product.

Price discrimination occurs when a seller charges different prices to different consumers for the same product or service, even when the cost of producing or providing that product is identical for all units sold.

In perfect competition, long-run equilibrium occurs where marginal revenue (MR) equals marginal cost (MC), and price (AR) equals average cost (AC). Because firms can enter or exit the market, economic profits are driven to zero, meaning price must equal the minimum point of the average cost curve, ensuring efficiency.

Price discrimination is effective when a firm can segment its market based on varying price elasticities of demand. By charging higher prices to consumers with inelastic demand and lower prices to those with elastic demand, the firm maximizes its total revenue. If elasticities were identical across all segments, the firm would have no incentive to differentiate pricing strategies.

Capitalism is defined by private ownership of the means of production and free-market competition. Government ownership or control of the major means of production is a defining characteristic of a socialist or command economy, not capitalism.