Okay, I’m sitting in my fortress of solitude and I’m getting a little hungry. I decide to drive to the local pizza place and buy a slice (paying gold naturally). Your land sits between my residence and the pizza place so I walk up to your border and give you a shout. You come over and meet me and we negotiate a fair price for me to travel across your property (and back - I’m not falling for that trick of you letting me leave my property cheaply and then raising the price for me to cross back to my home.)
So as I’m walking across your land, I happen to see your teenage daughter and her friends sunning themselves in your backyard. Having long since abandoned political correctness as the evil that it is, I whip it out and start masturbating.
You run up and are quite angry (although your daughter and her friends seem to be into it). You tell me I have to stop and I can’t do that on your property. But I point out that we’ve already reached a mutual agreement that I can be on your land and you didn’t include anything in it that said I couldn’t stop and have a masturbation break during my walk.
Or if you don’t like this scenario, here’s another. We’ve made our agreement and I’m walking across your property. But when I get halfway across, you point a gun at me and tell me you want a hundred dollars more from me. I protest that we had an agreement. You inform me that our agreement was only for me to walk across your property; we made no agreement for me to breathe your air. Being as I chose to walk across your property without holding my breath, I’m now obligated to reach a new agreement with you for the additional services I took without prior agreement.
I’m sure you see my point. Is there some objective standard of what’s reasonable or does every possibility have to be negotiated out on a case-by-case basis? Do we really have to spend hours negotiating over the terms of an agreement every time I want to go out for pizza?