[KavMan]

Yellen didn't raise interest rates; the Fed Open Market Committee did. Yellen was only one vote out of nine. Powell will be one vote out of eight until Trump fills the four vacant board of governor positions.

Isn't the Fed Chair the most important voice? If he/she says no to interest rate hikes then it doesn't happen?

[DoodleDawg]

Isn't the Fed Chair the most important voice? If he/she says no to interest rate hikes then it doesn't happen?

That's like saying isn't the Chief Justice of the Supreme Court the most important voice. On the FOMC the Fed Chair, like the Chief Justice, is first among equals. He has one vote. The other members don't march in lock step.