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Microeconomics Questions: Income Elasticity Effects

No Formal Report Needed. Just answer questions. 

How do you think income elasticity affects a normal good versus an inferior good? Provide an example. 
Why do economists use the term “elastic?”
What examples do you have of public goods? What is the free-rider problem? 
How do you think income elasticity affects a normal good versus an inferior good? Provide an example.