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Difficulty: EasyBudget Line and Budget Constraint

In consumer theory, the absolute slope of a budget line representing Good X on the horizontal axis and Good Y on the vertical axis measures which of the following?

  1. A
    The monetary expenditure required to purchase one unit of Good X
  2. The opportunity cost of Good X in terms of Good Y foregoneAnswer
  3. C
    The marginal rate of substitution derived from consumer preference curves
  4. D
    The total utility derived from the consumption of both goods

Answer

The opportunity cost of Good X in terms of Good Y foregone
The absolute slope of the budget line is given by the ratio of the prices of the two goods, PxPy\frac{P_x}{P_y}. This ratio reflects the rate at which the market allows a consumer to trade Good Y for Good X, representing the opportunity cost of acquiring an extra unit of Good X in terms of Good Y foregone.

Step-by-Step Solution

1
Determine the mathematical expression for the slope of the budget line.
The absolute slope of a budget line with Good X on the horizontal axis and Good Y on the vertical axis is given by the relative price ratio PxPy\frac{P_x}{P_y}.
The ratio of nominal prices indicates the market exchange rate between the two commodities.
2
Relate the price ratio to economic concepts.
The ratio PxPy\frac{P_x}{P_y} represents the quantity of Good Y that must be given up to obtain one additional unit of Good X.
Opportunity cost is defined as the value of the next best alternative foregone when making a choice.

Key Concept

Budget Line Slope as Relative Price and Opportunity Cost
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Topics

Budget Line and Budget Constraint

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