econ review.2

  • Demand and Elasticity:

    • Understanding elasticity: If demand is elastic, the quantity demanded changes significantly with price changes.

    • A negative slope of the demand curve shows the relationship between price and quantity demanded.

    • Example: A decrease in the price of basketball tickets causes a larger increase in quantity demanded, indicating elastic demand.

  • Indifference Maps and Budget Lines:

    • Larry's indifference map shows consumer preferences between two goods (ham and pork). A shift in the budget line reflects changes in income and consumption of goods.

    • If moving from point A to B on the indifference map indicates lower ham consumption as income increases, then ham is classified as an inferior good.

    • Goods can change from normal to inferior depending on income levels, illustrated by an example of fast food.

  • Substitution and Income Effects:

    • The substitution effect occurs when a price decrease leads to increased quantity demanded of a good, while the income effect relates to the change in consumption due to changes in real income affecting purchasing power.

    • Example analysis: Change from point A to B shows the substitution effect; B to C illustrates the income effect.

  • Labor-Leisure Model:

    • The model highlights a trade-off between working hours (income) and leisure time.

    • Wage increases lead to an upward rotation of the budget line:

      • The substitution effect (increased work hours due to higher wages).

      • The income effect (more leisure due to higher income) may outweigh the substitution effect.

  • Production and Cost Concepts:

    • The average product decreases when marginal product falls, demonstrating the relationship between productivity and output.

    • Isoquants are downward sloping lines indicating that inputs can substitute for each other; perfect substitutes create straight-line isoquants while perfect complements create right-angle isoquants.

    • MRTS (Marginal Rate of Technical Substitution) can be calculated for Cobb-Douglas production functions with given formulas.

  • Marginal Product and Hiring Decisions:

    • Marginal product of labor measures the additional output produced by hiring one more unit of labor.

    • Example with Jennifer's hiring decision illustrates how to calculate marginal product based on the output change when an employee is added.

  • Returns to Scale:

    • An increase in both inputs (capital and labor) leading to a less than proportionate increase in output indicates decreasing returns to scale. Conversely, a proportional increase indicates constant returns to scale.

  • Average and Marginal Cost:

    • Average total cost decreases where marginal cost is below average cost. When average total cost is minimized, it equals marginal cost.

    • Understanding costs in terms of fixed and variable components is crucial for analyzing production decisions and implications for profitability.

  • Opportunity Cost:

    • Opportunity cost includes all foregone opportunities from a business decision, such as lost wages and sacrifice of interest from investments.

  • Graphs in Economic Modeling:

    • Utilizing graphs can clarify relationships in economic theories, such as average cost and marginal cost relationships, or understanding production functions and isoquants visually.