With regard to the sixth principle, markets are usually a good way to organize economic activity. Firms decide who to hire and what to produce. Households decide which firms to work for and what to buy with their incomes. For this reason, they are interacting in the marketplace and interest primarily in their own well-being. It also explains why the firms are selling their merchandise overdue.
更新1:
:wingyi_0223
但我而家只係想你地幫我改下d文法~
而唔係中>>英,或英>>中!!