From the perspective of the market, Chinas travel service industry focus on the current market concentration rate, product differentiation and barriers to access to and I.

本文从市场理论的视角，对我国旅行社行业目前的市场集中度、产品差别化和进入退出壁垒和信息的对称度四个方面进行了分析。

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It is true that previous such attempts have come up short in the face of differences over market-access barriers and other long-standing irritants.

WSJ: Tom Donilon: The President's Free-Trade Path to Prosperity

The United States Trade Representative, in consultation with other members of the Export Promotion Cabinet, shall take steps to improve market access overseas for our manufacturers, farmers, and service providers by actively opening new markets, reducing significant trade barriers, and robustly enforcing our trade agreements.

WHITEHOUSE: Executive Order 13534 - National Export Initiative