Throughout part ii we shall be using the demand-supply framework to bring out basic points about the pros and cons of trade barriers.

在整个第二编中，我们将使用供求结构来阐明有关贸易壁垒利弊的基本论点。

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Available to employees on-demand as well as via mobile devices and tablets, online learning communities remove barriers dear to the hearts of brick-and-mortar universities and companies.

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For small business owners, it would remove barriers to growth, cut taxes, incentivize investment and create new demand.

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And tech-savvy pirates always seem to find a way around the barriers, as long as there is a demand for their stolen goods.

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