U.S. stocks  posted their first 2-week losing streak as the Treasury yield curve flattened further, raising concerns about economic growth while worries about tax reform percolated. The dollar dropped as the yen and gold gained.

The spread between two- and 10-year Treasury yields hit the tightest level in a decade. The greenback remained linked to political developments in Washington, where the Senate girded for negotiations on its version of tax reform.

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