1-Jim, after completing Year 12, was not sure whether to take a gap year, to attend university, or work full time. In the end, he decided to go to University. Define and explain the opportunity cost of Jim's decision to go to University.

2-Assume the amount of beer consumed in the pubs of Melbourne and the amount of rice eaten in the Melbourne restaurants have both been increasing over the last 20 years. Draw a graph showing their relationship. Use these two events to highlight the difference between the concepts of correlation and causation.