Insurers participating in joint underwriting, pools or residual market mechanisms may act in cooperation with each other in the making of rates, supplementary rate information, policy or bond forms, surveys, inspections and investigations, the furnishing of loss and expense statistics or other information and conducting research. If, after notice and hearing, the commissioner finds that any activity or practice of an insurer participating in a joint underwriting or pooling mechanism is unfair or unreasonable, or otherwise inconsistent with the provisions or purposes of this chapter, he may issue a written order specifying in what respects such activity or practice is unfair, unreasonable, anti-competitive or otherwise inconsistent with the provisions of this chapter and require the discontinuance of such activity or practice.