Question

Consider a change in the table in Problems 2-6. The student’s set of opportunities is now as follows: Does the PPC illustrate the law of increasing additional cost? What is the opportunity cost to this student for the additional amount of study time on economics required to move her grade from 60 to 70? From 90 to 100?

Economics	Biology
100	40
90	50
80	60
70	70
60	80
50	90
40	100

Short answer

The PPC does not follow the increasing cost of additionals.

The opportunity cost for moving her grades from 60 to 70 is 10 marks and from 90 to 100 is also 10 marks.

Step-by-step solution

Step 1. Given Information.

The data for the marks in Biology and Economics is,

Economics	Biology
100	40
90	50
80	60
70	70
60	80
50	90
40	100

Step 2. The PPC illusration.

The PPC is the various combinations that an economy can operate in a given time period.

The PPC does not follow the increasing cost of additionals as it is a linearr straight line.

Step 3. Opportunity Cost

The opportunity cost for moving her grades from 60 to 70 is 10 marks and from 90 to 100 is also 10 marks since a 10 marks increase in Economics will lead to 10 marks downfall in Biology.