[Turing_Machine]

The contract law behind buying a loaf of bread is well-codified and settled.

The term "social contract" means whatever the person using the term wants it to mean.

Not the same thing. At all.

[Iftheshoefits]

If it's well-codified and settled then you'll have absolutely no problem providing a complete, and completely uncontroversial, version of it.

[Turing_Machine]

http://en.wikipedia.org/wiki/Uniform_Commercial_Code

Enjoy.