You are investing your resources in a college education because A. you have no opportunity cost for the use of your time. B. there is no trade-off for you between current and future consumption. C. your personal PPC will grow faster by investing in human capital and you will be better off. D. there is no opportunity cost for money spent on tuition.

PPC - ''pay-per-click'' is a representation of internet marketing and it's most popular form is engine advertising. An example of how it's applied - a person owns a company and wants more people visiting company's site. They place online advertisement on various web pages that can show the result of search engine inquiries or even some other web pages that do not have the same content. They pay a fee whenever someone clicks on their ad.