215 ILCS 5/454
The purpose of this Article is to promote the public welfare by regulating workers' compensation and employer's liability insurance rates to the end that they shall not be excessive, inadequate or unfairly discriminatory, or erroneously applied and to authorize and regulate co-operative action among companies in rate making and in other matters within the scope of this Article. Nothing in this Article 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. This Article shall be liberally interpreted to carry into effect the provisions of this Section. Section 462b of this Article is a codification of existing law and practice.
215 ILCS 5/454