Given the choice between a private contract and government legislation, most companies would likely choose private contracts.
IANAL or a historian but from other discussions I read, I got the impression that, at the time, contract law wasn't as advanced as it is today. That's likely why it took a law to clear the way for franchises.
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A proper contract would allow for an immediate injunction as releif.
What makes you assume that's even on the table? What manufacturer is going to give away the fruits of their power imbalance so readily?
Given the choice between a private contract and government legislation, most companies would likely choose private contracts.
IANAL or a historian but from other discussions I read, I got the impression that, at the time, contract law wasn't as advanced as it is today. That's likely why it took a law to clear the way for franchises.