In the exercise of the powers contained in Section 2.1, the Commission shall have the right to contract with persons, firms, corporations or governing bodies to furnish fire, police and ambulance services to property and persons outside the city boundaries for a fair consideration, if the Commission shall find that the financial interests of the city are advanced by obtaining payments therefor; or that the prosperity of the municipality and the inhabitants are advanced through preventing a conflagration which might spread within the city or through protecting from fire industrial or commercial properties at which residents of the city are employed.