Dan Sullivan quotes
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The document is not the contract; it is merely evidence of the contract. The contract is simply the mutual understanding between parties, and is usually based on custom. My favorite example is that when you visit someone's home and they as what you would like for dinner, the assumption by custom is that it is a free dinner. When you enter a restaurant, the assumption is that they are asking you what dinner you would like to purchase. There is a contract in the latter case, whether you signed anything or not.
When you acquire property in a municipality, you have agreed to any terms of that municipality that are consistent with custom whether you have signed anything or not. Even contracts within condo associations do not have to include items that are consistent with custom, as such items are generally understood.