(Figure: Good Y and Good X VI) Assume that the price of Good X is $100 per unit and the price of Good Y is $100 per unit. When income increases from $1,200 to $1600, Good Y is a (an) _____ good. 
Definitions:
Macular Degeneration
A medical condition that results in blurred or no vision in the center of the visual field due to damage to the macula, part of the retina in the eye.
Diabetic Retinopathy
A diabetes complication that affects the eyes, caused by damage to the blood vessels of the light-sensitive tissue at the back of the eye (retina).
Cataracts
A medical condition where the lens of the eye becomes progressively opaque, resulting in blurred vision.
Unilateral Neglect
A neurological condition in which a person is unable to process and perceive stimuli on one side of the body or environment, often due to brain damage.
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