The income and substitution effects explain which of the following?

Question

BlackTom AI · Accepted Answer

To approach this question, consider what the income and substitution effects describe in consumer theory.
Option 1: Decreasing marginal productivity of labor is a concept from production theory, not about how consumers respond to price changes in a demand context, so this is not explained by income and substitution effects.
Option 2: The downward slope of the market demand curve is precisely what the income and substitution effects explain. When the price of a good falls, the substitution effect makes the good more attractive relative to its alternatives, leading to more quantity demanded. At the same time, the higher real purchasing power (income effect) can enable more consumption of the good, further increasing quantity demanded. Taken together, these effects generate the typical downward-sloping demand curve.
Option 3: Market power caused by barriers to entry relates to competition and market structure, not to the behavioral responses captured by income and substitution effects, so this is irrelevant to the explanation of the demand curve’s slope.
Option 4: Increasing returns to scale is a production concept describing output increasing more than proportionally with input, not a consumer response to price changes, thus unrelated to income and substitution effects.
Option 5: Increasing marginal cost of production concerns the supply side and production costs, not the consumer-side effects used to derive the downward slope of demand from price changes, so this is incorrect in this context.

The income and substitution effects explain which of the following?单项选择题

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