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 ...

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 ...

Caves, R. E., and M. E. Porter. "Market Structure, Oligopoly and the Stability of Market Shares." Journal of Industrial Economics 26, no. 4 (June 1978): 289–313.

Welfare effects of entry regulations are theoretically ambiguous in differentiated product markets. We use a dynamic oligopoly model of entry and exit with store-type differentiation and static price ...