Convexity of Angela's and Karim's Preferences

A research study observed the behavior of Brazilian fishermen in a controlled game designed to measure cooperation. The study found a strong positive correlation between the level of cooperation a fisherman showed in the game and how sustainably they fished in their actual, day-to-day work. What is the most significant implication of this finding for the field of economics?

Imagine a graph representing an individual's preferences for two goods: 'daily free time' on the horizontal axis and 'bushels of grain' on the vertical axis. Point A and Point B both lie on the same downward-sloping indifference curve. Point C is located on a different indifference curve, positioned above and to the right of the curve containing points A and B. Based on the standard model of preferences, which of the following statements must be true?

Inferring Preferences from Behavior

Consider a graph that models an individual's preferences for two goods: 'Daily Free Time' on the horizontal axis and 'Grain Consumption' on the vertical axis. The graph contains two standard, downward-sloping, convex indifference curves, IC₁ and IC₂.

• Points A and B are both located on the lower indifference curve, IC₁.
• Point C is located on the higher indifference curve, IC₂.
• Point D is located in the area below and to the left of IC₁.

Based on this model, which of the following statements is a correct interpretation of the individual's preferences?

An individual's preferences for 'weekly consumption' (vertical axis) and 'hours of free time' (horizontal axis) are represented by a standard, downward-sloping, convex indifference curve. Point A on this curve corresponds to a high level of consumption and a low amount of free time. Point B, on the same curve, corresponds to a low level of consumption and a high amount of free time. Which statement best describes the individual's willingness to trade consumption for free time?

Two individuals, Alex and Ben, both derive satisfaction from two goods: 'daily consumption' (plotted on the vertical axis) and 'hours of free time' (plotted on the horizontal axis). Their preferences are represented by standard, downward-sloping, convex indifference curves. At any specific combination of consumption and free time (e.g., at the point representing $50 of consumption and 18 hours of free time), Alex's indifference curve is consistently steeper than Ben's. What does this difference in steepness imply about their preferences?

Comparing Preferences Graphically

Match each graphical feature of an indifference curve map, which plots combinations of two goods, with its correct economic interpretation.

Evaluating a Preference Model

Graphical Representation of Differing Preferences

Consider a graph that models an individual's preferences for two goods: 'Daily Free Time' on the horizontal axis and 'Grain Consumption' on the vertical axis. The graph contains two standard, downward-sloping, convex indifference curves, IC₁ and IC₂.

• Points A and B are both located on the lower indifference curve, IC₁.
• Point C is located on the higher indifference curve, IC₂.
• Point D is located in the area below and to the left of IC₁.

Based on this model, which of the following statements is a correct interpretation of the individual's preferences?