All other things equal,a company's return on investment is affected by a change in which of the following? 
Definitions:
Oligopoly
A market structure characterized by a small number of firms dominating the market, where each has significant control over prices and supply.
Product Differentiation
The process of distinguishing a product or service from others in the market to make it more attractive to a particular target market.
Oligopoly Market
A market structure characterized by a small number of firms controlling a large majority of the market share, leading to limited competition.
Output
The total amount of goods and services produced by an economy or a production process, serving as a key indicator of economic health.
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