一：鞋子生命周期

一款新鞋子需要大量的廣告來宣傳，大量的產(chǎn)品進(jìn)入市場后開始慢慢成熟，收到人們青睞。隨著時間推移，產(chǎn)品開始過時，需求下降。

圖片發(fā)自簡書App

二：Product live cycle

主旨：The product cycle is an economic theory that was developed by Raymond Vernon in response to the failure of the Heckscher-Ohlin model to explain the observed pattern of international trade.

關(guān)鍵單詞：economic、international trade、applies、comparative

https://en.m.wikipedia.org/wiki/Product_life-cycle_theory