Christopher Harvey, Wells Fargo Securities Head of Equity Strategy, discusses outlook for the markets and high-flying stocks. Alicia Levine, Bank of New York Mellon Chief Investment Strategist, says cash is king right now. Megan Greene, Harvard Kennedy School Senior Fellow, says there is a real credibility issue for the Fed. Mike Darda, MKM Partners Chief Economist & Market Strategist, discusses Fed Chair Jerome Powell's announcement of a new approach to policy that takes a more relaxed stance on inflation.