To illustrate the concept of choice, we should first understand opportunity cost. This is defined as the next best alternative given up when making a choice. To demonstrate this concept, we will use a production possibility curve.

Step 1: Understand Opportunity Cost. Opportunity Cost is defined as the value of the next best alternative that must be given up when making a choice. In the context of a Production Possibility Curve (PPC), it's the amount of one good that must be sacrificed to produce an additional unit of another good. Step 2: Calculate the opportunity cost of producing more Butter when moving from point A to B. At point A, the economy produces 15 Guns and 0 Butter. At point B, it produces 14 Guns and 5 Butter. To produce an additional 5 units of Butter (from 0 to 5), the economy gives up 15 - 14 = 1 Gun. The opportunity cost of producing 5 units of Butter is 1 Gun. The opportunity cost per unit of Butter is 1 Gun5 Butter = 0.2 Guns per Butter. Step 3: Calculate the opportunity cost of producing more Butter when moving from point B to C. At point B, the economy produces 14 Guns and 5 Butter. At point C, it produces 10 Guns and 10 Butter. To produce an additional 5 units of Butter (from 5 to 10), the economy gives up 14 - 10 = 4 Guns. The opportunity cost of producing 5 units of Butter is 4 Guns. The opportunity cost per unit of Butter is 4 Guns5 Butter = 0.8 Guns per Butter. Step 4: Calculate the opportunity cost of producing more Butter when moving from point C to D. At point C, the economy produces 10 Guns and 10 Butter. At point D, it produces 5 Guns and 14 Butter. To produce an additional 4 units of Butter (from 10 to 14), the economy gives up 10 - 5 = 5 Guns. The opportunity cost of producing 4 units of Butter is 5 Guns. The opportunity cost per unit of Butter is 5 Guns4 Butter = 1.25 Guns per Butter. Step 5: Calculate the opportunity cost of producing more Butter when moving from point D to E. At point D, the economy produces 5 Guns and 14 Butter. At point E, it produces 0 Guns and 15 Butter. To produce an additional 1 unit of Butter (from 14 to 15), the economy gives up 5 - 0 = 5 Guns. The opportunity cost of producing 1 unit of Butter is 5 Guns. The opportunity cost per unit of Butter is 5 Guns1 Butter = 5 Guns per Butter. The opportunity costs for increasing butter production are: From A to B: 1 Gun for 5 units of Butter (or 0.2 Guns per unit of Butter) From B to C: 4 Guns for 5 units of Butter (or 0.8 Guns per unit of Butter) From C to D: 5 Guns for 4 units of Butter (or 1.25 Guns per unit of Butter) From D to E: 5 Guns for 1 unit of Butter (or 5 Guns per unit of Butter) Got more? Send 'em.