There was an interesting exchange during Janet Yellen’s testimony before the House Financial Services Committee on Wednesday morning, when South Carolina Republican Mick Mulvaney asked Yellen if the Fed will openly (as opposed to indirectly via Citadel) buy stocks. Specifically, he said that “there’s been some attention in the last few months about the resent decision by the Bank of Japan to start purchasing equities and my question to you is fairly simple.