Chapter 4 Key Terms & Definitions

Chapter 4 Key Terms & Definitions

Factor of Production

• Definition: An input used in the production of a good or service.

Fixed Cost

• Definition: The sum of all payments made to the firm’s fixed factors of production, which do not change with the level of output.

Fixed Factor of Production

• Definition: An input whose quantity cannot be altered in the short run, meaning that the firm cannot change its quantity in response to changes in market demand immediately.

Imperfectly Competitive Firm (or Price Setter)

• Definition: A firm that has at least some control over the market price of its product, due to factors like product differentiation or limited competition.

Law of Diminishing Returns

• Definition: A property of the relationship between the amount of a good or service produced and the amount of a variable factor required to produce it.
  • Explanation: It states that when some factors of production are fixed, increasing production of the good eventually requires ever-larger increases in the variable factor, leading to a decrease in the incremental output from each additional unit of input.

Long Run

• Definition: A period of time of sufficient length that all the firm’s factors of production are variable, allowing the firm to adjust all inputs to achieve optimal production levels.

Marginal Cost

• Definition: The increase in total cost that results from carrying out one additional unit of an activity, critical for understanding how different levels of output affect overall costs.

Perfectly Competitive Market

• Definition: A market in which no individual supplier has significant influence on the market price of the product, characterized by many buyers and sellers, homogeneous products, and easy entry and exit.

Perfectly Elastic Supply

• Definition: Supply is perfectly elastic with respect to price if the elasticity of supply is infinite, meaning that any change in price leads to an infinitely large change in quantity supplied.

Perfectly Inelastic Supply

• Definition: Supply is perfectly inelastic with respect to price if the elasticity is zero, indicating that quantity supplied remains unchanged regardless of price changes.

Price Elasticity of Supply

• Definition: The percentage change in quantity supplied that occurs in response to a 1 percent change in price, measuring how sensitive the supply of a good is to price changes.

Price Taker

• Definition: A firm that has no influence over the price at which it sells its product, typically in perfectly competitive markets where prices are determined by the market rather than individual firms.

Profit

• Definition: The total revenue a firm receives from the sale of its product minus all costs—explicit and implicit—incurred in producing it.
  • Formula:
    $\text{Profit} = \text{Total Revenue} - \text{Total Costs}$

Profit-Maximizing Firm

• Definition: A firm whose primary goal is to maximize the difference between its total revenues and total costs, often achieved when marginal cost equals marginal revenue.

Short Run

• Definition: A period of time sufficiently short that at least some of the firm’s factors of production are fixed, impacting how the firm can respond to market changes.

Total Cost

• Definition: The sum of all payments made to the firm’s fixed and variable factors of production, reflecting all costs incurred in the operation of the business.
  • Formula:
    $\text{Total Cost} = \text{Fixed Costs} + \text{Variable Costs}$

Variable Cost

• Definition: The sum of all payments made to the firm’s variable factors of production, which change as the level of output changes.

Variable Factor of Production

• Definition: An input whose quantity can be altered in the short run, allowing the firm to adjust its production levels in response to fluctuating market demands.