Derive the stopping rule for investments in education.

Which theory does best explain the increasing trend in obesity in the past 150 years     Decline in food prices     Changes in the food industry     Genetics     Increase in women’s labor force participation

Suppose the following graph shows the earnings trajectory of college-educated workers (orange line) and of workers with only a high school diploma (blue line), through age 34. Use the grey quadrilateral (star symbols) to shade the area representing the direct costs of attending college for four years. Then use the purple quadrilateral (diamond symbols) to shade the area representing the opportunity cost of attending college for four years rather than entering the work force immediately after completing high school. Finally, use the green quadrilateral (triangle symbols) to shade the area representing the difference in earnings between college graduates and high school graduates between the ages of 22 and 34. Hint: Be sure that the coordinates of the end points of the quadrilaterals are exactly the same as the coordinates of the areas they are to cover. Once the quadrilateral is in place, click on it to show the value of the shaded area. EARNINGS AND COST (Thousands of dollars) 100 8 60…

Summarize changes to the distribution of income since 1980. Is is analysis positive or normative? Why?