Answer:
Difficult entry, Mutual interdependence, Market is control by a few large firms.
Explanation:
An Oligopolistic market very few organisations control a particular market share. Likewise, when another organisation attempts to enter the market, there are obstructions set up by the current organisations. Similarly, if one organisation changes or alter a commodity, it affects all other firms and organisations. So there is mutual interdependence in the oligopolistic market. There is high mutual interdependence because firms produce identical or the same goods and services.