Refer to the information provided in Figure 1.5 below to answer the question(s) that follow. Figure 1.5Refer to Figure 1.5. Which of the Panels shows a curve or line that has a slope that is positive and increasing?

One reason economists began to look at more effective coordination mechanisms is that they began to:

A. focus more on the assumption that people are rational. B. focus more on people's predictably irrational behavior. C. rely more heavily on deductive reasoning. D. use advanced calculus in their models.

In 2015, the population of the world

A. was approximately 500 million people. B. fell below 2 billion people. C. was more than 7 billion people. D. was close to 1 trillion people.