U.S. President Donald Trump, center, speaks during a meeting with steel and aluminum executives in the Cabinet Room of the White House in Washington, D.C., U.S. (Photographer: T.J. Kirkpatrick/ Bloomberg)

What Happened in the World Economy This Week and What It Means

(Bloomberg) -- Just when it looked like the global economy was running on all cylinders, President Donald Trump injected a degree of risk to the otherwise favorable outlook.

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