Mich. Comp. Laws § 500.2600
The purpose of this chapter is to promote the public welfare by regulating insurance rates to the end that they shall not be excessive, inadequate or unfairly discriminatory, and to authorize and regulate cooperative action among insurers in rate making and in other matters within the scope of the insurance code. Nothing in this chapter is intended (1) to prohibit or discourage reasonable competition, or (2) to prohibit, or encourage except to the extent necessary to accomplish the aforementioned purpose, uniformity in insurance rates, rating systems, rating plans or practices. Conformity with this chapter shall not be deemed to be a violation of section 2075 (compacts to restrain competition prohibited). This chapter shall be liberally interpreted to carry into effect the provisions of this section.
MCL 500.2600