1.3.1.4b - distinction between movements along, and shifts in, production possibility frontiers,

The distinction between movements along, and shifts in, production possibility frontiers, and their possible causes.

Use b - distinction between movements along, and shifts in, production possibility frontiers, to connect the rule to the data and decision in the question.

This matters because b - distinction between movements along, and shifts in, production possibility frontiers, determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply b - distinction between movements along, and shifts in, production possibility frontiers, to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: b - distinction between movements along, and shifts in, production possibility frontiers, is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.