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'''5. Explain why the shape of an indifference curve for two goods that are perfect substitutes is a straight line going from the upper left down to the lower right. Extra credit: why must its slope be negative 1?   
 
'''5. Explain why the shape of an indifference curve for two goods that are perfect substitutes is a straight line going from the upper left down to the lower right. Extra credit: why must its slope be negative 1?   
 
'''
 
'''
Because both are perfect substitutes for each other, they are both equally preferred. Extra credit: The slope must be negative one in order to substitute one good for another.  
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Because both are perfect substitutes for each other, they are both equally preferred.
    
'''6. Describe either the "income effect" or the "substitution effect." Take your pick:'''  
 
'''6. Describe either the "income effect" or the "substitution effect." Take your pick:'''  
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