(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 X is a (an) _____ good. 
Definitions:
Speech Deficits
Impairments or disorders that affect a person's ability to communicate verbally in a clear and understandable manner.
Retrieval Cues
Stimuli or prompts that enable or enhance the recall of information from memory.
Recall
The mental process of retrieving information or events from the past without being explicitly prompted.
Storage
The process of retaining encoded information over time.
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