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:
Sensory Adaptation
The process by which sensory receptors become less responsive to constant stimuli over time.
Absolute Threshold
The minimum intensity of stimulation that must occur before you experience a sensation.
Detection Threshold
The minimum level of intensity at which a stimulus is perceived or detected by the sensory system.
Just Noticeable Threshold
The minimum difference in stimulation that a person can detect 50% of the time; also known as the difference threshold.
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