Answer:it depends
Explanation: sustainability of what?
A country? A company?
As long as we maintain anything economically and or socially
Since the 1990s , trade has grown very fast driven by a mix of technological change and policy reforms . With the exception of 2009 trade growth has still remained positive and much bigger than economic growth . This underlined clearly that trade is effective engine for growth.
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The answer is B. The citys tax base begins to increase because if it is redlines then they have to move somewhere else where it is harder to get money so they have to increase the taxes