The best response to the question is:
The benefits are that Aaron will be more productive, which will lead to more output, as well as increased human capital as a result of his videos. The costs to Aaron are the time and money to take the course, along with any forgone income that could have been earned during this time.
This response accurately reflects the benefits to both Aaron and society. As Aaron becomes more skilled through the course, he is likely to produce higher-quality content, which can contribute positively to society by enhancing public understanding of economic concepts. Additionally, the response acknowledges the various costs that Aaron faces beyond just the financial expense of the course, including time and potential lost income, providing a comprehensive view of his situation.