Opportunity costs as they say

Economics is very interesting subject but many Professors in Economics only sit on their chairs comfortably because they are very secured of their certifications and recognition.

When I was in college I understood why a lecturer in particular suddenly got angry bombastically because anyone's PhD or Masters can always be confiscated due to one's inability to define opportunity costs in exact terms.

For example, if a restaurant closes shop for 100 days due to change of premiership, which it could earn a nett profit of RM500 per day, how much is the opportunity costs forgone for the sake of renovations? Please be reminded that renovation cost is not capital in nature if it does not change the structure and economic usage of the premises. That means the cost must be included in the book value of the premise in order for it to be termed as capital expenditure.

Many lecturers teaching Economics n accounting are too lame nowadays no wonder why they do not fight for lower prices of cars.