# of Firms Product Diff. Entry/Exit
Perfect Competition Many None Free
Monopoly One None Highly Restricted
Monopolistic Competition Many Significant Free
Oligopoly Few Some Restricted
   To the left is a table showing the primary characteristics which define the four main industrial structures typically studied. As we study each type of industry, we will consider in detail the role each of these characteristics play in explaining individual firm decision making, and overall industry behavior.

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