Indiana Code Title 24. Trade Regulation § 24-5-2-21

Sec. 21. No manufacturer shall sell or contract to sell specific goods which may become the subject-matter of a retail installment sale in this state, whether patented or unpatented, to any retail seller in this state on the condition or with an agreement or understanding, express or implied, that the retail seller shall sell, assign or transfer any retail installment contracts arising from the retail installment sales of the goods, or any part thereof, only to a designated licensee or class of licensees, when the effect of the condition, agreement or understanding may be to lessen or eliminate competition, or create, or tend to create, a monopoly in the licensee or class designated.  Any such condition, agreement or understanding with any retail seller in this state is hereby declared to be against the public policy of this state and to be unlawful and void.