Mich. Comp. Laws § 500.5210: Dealing in commodities prohibited; exception.

Sec. 5210.

No domestic property or marine or inland navigation and transportation, or automobile (limited) insurer shall, directly or indirectly, deal or trade in buying or selling any goods, wares, merchandise or other commodities whatever, excepting such articles as may have been insured by such insurer, and are claimed to be damaged by fire or water.