Figure 21-31 The figure shows two indifference curves and two budget constraints for a consumer named Kevin. 
-Refer to Figure 21-31. For Kevin, are sweaters and shirts substitutes, complements, or neither?
Definitions:
Cones
Photoreceptor cells in the retina that are responsible for color vision and function best in relatively bright light.
Visual Receptors
Visual receptors are cells located in the retina of the eye that are sensitive to light and enable vision.
Retina
The light-sensitive layer of tissue at the back of the inner eye, which converts light images into electrical signals sent to the brain.
Optic Nerve
The nerve that transmits visual information from the retina to the brain.
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