What impact does a U.S. President have on an Economy, without the consent/approval of Congress?

What impact does the U.S. President have on the Economy, without Congress?

In other words... What can the U.S. President do merely on his own, concerning the economy?
Update: Veto? I thought Congress could override the President's veto with a two-thirds majority.. (which I see possible with a Democratic-Congress).

I'm not arguing, I'm just trying to get the facts straightened out.
Update 2: Cutter,

You are misinformed.
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