Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Somer G. Anderson is CPA, doctor of ...

Retail market structure refers to the number of companies that sell similar or identical products in the same geographical area. An oligopoly describes a small group of companies that collude to raise ...

Discover what a duopoly is, its economic significance, and how it compares to other market structures like oligopolies. Learn ...

As a small-business owner, you're probably an avid reader of financial and economic news. And like many of your colleagues, you probably scratch your head over some of the headlines you read about ...

Three firms dominate the target date fund market, constituting an oligopoly. One firm – Vanguard – owns 72% of the passive TDF market, constituting a monopoly. Oligopolies and monopolies are bad. They ...

A refinery has been brought to trial for colluding to set oil supply prices, using the war between the United States and Iran as a pretext. The compan ...