我認為production approach都可以
我地可以睇翻題目入面resident producing unit既value added
個$3M teaching service正正就係由RPU額外增加既價值
所以當年呢題既答案接受你寫:
The course is a current-year production by a resident producing unit.
或者the $3M represents the consumption expenditure by households.亦可
其實如果有學simple circular flow model,應該有留意到total output=total expenditure,所以production approach同expenditure approach 既outcome理應相同