What is a Lorenz curve? How can it be used to show the degree of inequality of income distribution? Given the data for Brazil shown, draw a Lorenz curve. Is the income distribution relatively equal or unequal? Explain how you reached your answer. 
Definitions:
Imperfect Competition
A market structure in which no firm is a monopolist, but producers nonetheless have market power they can use to affect market prices.
Oligopoly
A market structure characterized by a small number of firms controlling a large majority of the market share.
Quantity Effect
The impact on total revenue when the quantity sold changes while the price remains the same.
Marginal Cost
The increased expenditure resulting from making an additional unit of a product or service.
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