關于A-level考試，在這邊小編真誠地建議同學們,，大家就把contestable market當作一個new market,，在你還不是很熟悉他的時候，不要把他與其他market structure聯(lián)系起來,，等你對他認識充分的時候,，你盡可以大膽地將之與其他market 進行比較，不過切記,，距離產(chǎn)生美,。
　　關于contestable market的幾大特點要牢牢把握：
　　定義如下:
　　Contestable market: any market structure where there is a threat that potential are free and able to enter this market.
　　特點如下：
　　The number of firms in the industry may vary from one (a monopolist) having complete control of the market, to many, with no single firm having a significant share of the market.
　　In a contestable market, there is freedom of entry to and exit from the market. This means there will be no sunk costs.
　　Firms are short-run profit maximisers, producing where MC = MR.
　　There is perfect knowledge in the industry.
　　The potential forhit-and-runcompetition exists.
　　重中之重點小編已經(jīng)畫出來了，大家務必注意,，在寫作的時候你會發(fā)現(xiàn)永遠離不開對low barriers,，sunk cost的討論，從而努力證明某某市場具有contestability,。
　　所以,，這里也要求同學們獨具慧眼地在材料中尋找可能跟contestability相關的蛛絲馬跡,。