Meni sa baš čini da je osporivo tržište najbolji prijevod. Predloženim alternativnim prijevodima nedostaje značenje osporavanja:

"...average cost pricing will remain, even in the case of markets with few suppliers, when the market is contestable, i.e. there are potential competitors who are able to enter and exist rapidly"

Osim toga, radi se o teorijskom konceptu koji je dovoljno prepoznatljiv sam po sebi. I ako ga je već autor teorije takvog odabrao, valjda je to učinio s razlogom.

The theory of contestable markets suggests that even if there is only one seller, ... A perfectly contestable market is one in which entry and exit are ...
www.tutor2u.net/economics/content/topics/monopoly/contestab...
When the possession of market power is profitable, it should attract new entrants into the industry. If entry is easy, then the existence of very few or even only one firm may not result in economic inefficiency. The threat of potential entry may be enough competition to keep the industry operating at or close to the competitive price and output. In this case the market is a contestable market.

Contestable Markets Theory developed by William Baumol. ... theory defines contestability as the effectiveness of barriers to entry and exit in a market. ...
www.economyprofessor.com/economictheories/contestable-marke...


Da bi konkurencijski proces djelovao, nužno je ne samo da su poduzeća izložena konkurenciji drugih, da su tržišta 'osporiva', da se uklanjaju meka budžetska ograničenja (konkurencija je ...


efzg.globalnet.hr/UserDocsImages/ETE/FRANICEVIC/Pilar_edited_final_lektorirano(kao%20u%20knjizi).pdf