natural law and contract law in its core

yes, so many details are really well put:

• signing with blood
• how someone putting up a sign would work for food

once accept the food, one should do the work, yet all that man want is food without working and that's breaking the contract.

Takeaway
be aware of any contracts, especially the verbal ones - don't promise anything if you can't deliver, and always be CLEAR about the details.