Econ: Opportunity cost (急）

無錯Opportunity cost 就是 highest-valued option forgone.
如果你選擇（1）， 你就會放棄左(1)入邊既$200買飛同埋1個鐘既排隊時間..
同時你都放棄選擇（2），去教琴所賺到既$150.

所以簡單咁講句就係你選擇（1），就會放棄左選擇(1)+(2)既成本..
姐係 選擇(1)既$200買飛同埋1個鐘既排隊時間，
兼 選擇(2)教琴賺既$150 呢個係full-cost concept

希望幫到你=]..

the highest-valued option forgone係最高價值forgone,$200+1hr > $150,so個ans係$200+1hr
ps去琴行教琴所損失的 150元大唔過200蚊+1hr

In economics, the opportunity cost is the highest value forgone. In a simple example, If a person can choose to go for a party or study during one hour, then, the OC for going to the party is the studying time and the OC for study is party, this is a basic assumption but it cannot be applied in your question because your question has the time given which will affect the OC.

For example, If that person chooses to go the concert, he has to paid and spend 1 hour, so the opportunity cost is his cost and the 1 hour because he has to spend on his expenditure, as he goes to buy the ticket only, it will not give him the direct satisfaction, so, it is his opportunity cost. As a conclusion, this is a tricky question, e.g, if the question said that he goes for a concert or he can teach piano, the opportunity cost of going to the concert is the money earned for piano lessons.

* this is tricky because he only goes to buy the ticket but not to enjoy it.