annaboa 問: what is the demand relationship between fish and fishfeed?derived demand??joint demand?competitive demand?
annaboa,
首先要搞清楚derived demand (衍生需求), joint demand (complements相輔物品) 同埋competitive demand (substitutes代替品)嘅意思先。
Derived demand: 譬如要起多D樓嘅時候, 地產發展商會買多D水泥去起樓, 咁demand for 水泥就叫derived demand喇。Complements: 譬如多D人買DVD响屋企睇戲, 齋有DVD機但冇DVD碟係睇唔到戲, 所以D人會去買DVD碟, 呢個叫complements, 小心咪將complements 同derived demand 撈亂, complements 係要同時用先「有料到」, 即係要DVD機同碟一齊先有野睇, 但 derived demand就有先後嘅因果關係, 要有水泥先可以起樓, 唔係水泥同樓一齊用。Substitutes: 譬如coca-cola 同pepsi, 如果coca-cola買咗, 有D人會移情別戀去買pepsi, 呢個叫substitutes。
Annaboa, 咁你話如果多咗人養魚, 咁佢地會去買魚糧, 敢你話係以上邊一種呢?
經濟友
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