Figure 21-31 The figure shows two indifference curves and two budget constraints for a consumer named Kevin. 
-Refer to Figure 21-31. If point A is Kevin's optimum, then at that optimum, what is his opportunity cost of a shirt in terms of sweaters?
Definitions:
Heritability Estimates
Statistical measures that describe how much of the variation in a trait among individuals within a population can be attributed to genetic differences.
S-shaped Curve
A curve that depicts a process of growth or spread, starting off slowly, increasing rapidly, and then leveling off, resembling the shape of the letter "S".
IQ Scores
Numerical scores derived from standardized tests designed to measure human intelligence and cognitive abilities relative to an age group.
IQ Test
A standardized assessment tool used to measure a person's intelligence quotient, which is an indicator of their cognitive abilities relative to the population.
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