Critical Reasoning (CR) | The growth of the market for self-portraits of 19th century artists ha

The growth of the market for self-portraits of 19th century artists has not stopped increasing in the past twenty years , due to a concomitant rise in both the number of museums and in the interest of collectors in Eastern Asia. However, the fact that the market has been growing for the past two decadesdoes not mean it cannot shrink as well. An international financial crisis may change the current direction the market is taking.

In the argument, the two portions in boldface play which of the following
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