An example of law and demand at work would be ordering enough supplies to work with regardless of the price so that the job can get done.
Sorry i just did this for points
The manor system was important because people lived on feudal ground owned by rich land owners. Those people were tightly connected to the catholic church and they all swore their allegiance to the pope. The people were all religious and they worked on the land and could keep a part of what they produced but they had to give a part to the manor owner. The owner would provide protection in return.
The greater and Lesser Antilles, which are two different islands above and below one another. I hope this helped :P