Over the past four years, Janet Yellen has steered the Federal Reserve through uncharted waters as the central bank has begun to undo the unconventional policy implemented in the aftermath of the crisis.

When asked by former governor of the Bank of England Mervyn King the greatest lesson she had learned over said period, Yellen said it was to keep an open mind. “You cannot simply assume history is repeating itself. Things are always changing, there are always puzzles,” she said.

Yellen