Answer to Question 1
Queuing is the process of waiting in line as a means of distributing goods and services: a non-price rationing mechanism.
Answer to Question 2
The utility possibilities frontier is a graphical representation of a two-person world that shows all points at which A's utility can be increased only if B's utility is decreased. A point inside the utility possibilities frontier is inefficient, because at that point it would be possible to make both people better off. A point on the utility possibilities frontier is efficient. The point on the utility possibilities frontier that society arrives at is determined by the individuals' initial endowments of wealth and skills.