There is another concept, called “opportunity cost in a life”.
It means that if you use your time or money (resource) for one purpose now, you cannot use them for others.
Taking a simple example, if you buy a cup of coffee with 100 yen, you cannot use that 100 yen to buy chocolate. So, the cost of choosing coffee is no chocolate.
Then thinking about time, 2 hours of time can be used for doing sports, attending study group, watching TV, eating cakes, etc.
Generally thinking under the theory of economics, it’s reasonable to choose the most valuable option. However, usually people tend to choose the easiest one.
Not value, but ease.
