According to a report from the US Census Bureau, “the average lifetime earnings of a full-time year round work with a high school education is about $1.2 million, compared to about $2.1 million for a college graduate. This indicates that there is a considerable benefit to a graduate from investing in his or her own education. Tuition at most state universities covers only about 2/3 – ¾ of actual costs, so the state provides a subsidy to college education. If this subsidy is appropriate, is the externality created by the college education a positive or negative externality? What does this imply about the costs and benefits to the student as opposed to the costs and benefits to society in general? What are some reasons for the differences?