5a. The three economic problem are
呢條係人都識
但係後面仲有條5b.
These problems are tackled by
1.
2.
3.
呢條就唔識答啦--
問多兩條
What are superior goods?
What are inferior goods?
雖然知係咩，但係唔識寫定義－－
更新1:
應該係The three economic basic problem are 即係what to produce how to produce for whom to produce