An editorial in the paper argues that a person only should be allowed to attend school if the marginal cost of educating that person is less than the marginal benefit of educating that person. The writer's reasoning is an application of:

c

Explanation:

application of:

A. positive economics. B. negative economics. C. normative economics. D. economic naturalism.

Positive Economics is objective and statements are usually based on facts and economic theory. They can be tested.  

For example, an increase in input would lead to a decrease in supply of the good is based on economic theory and facts. An increase in input would increase the cost of production and this would discourage sellers from producing.  

Normative economics is based value judgements, opinions and perspectives. For example, the statement - social welfare spending in Sweden occupies too large a portion of the national budget - is based on opinion. To some the expenditure might be even too small. There is no economic theory that can be used to determine if this expenditure is too large or small

in terms of experimental research, mcdonald’s charging different prices in the two cities relates to

it's actually a very difficult task, due to not many people can make 2 million dollars in 2 years. besides that, to the not-so-realistic ideas, you can create a business. it could be practically anything, but make it into a business that isn't that known yet, you get me? also, lets not forget about stock market. that's where all the good stuff happens. use investments at the beginning and begin to raise up your business or whatever you're going to do. as this is a very non-realistic idea, it's still worth the shot!