We've heard a lot about the challenges for the U.S. Federal Reserve as it tries to strike a balance between sustaining economic growth and battling inflation. The European Central Bank is also engaged in a challenging balancing act, trying to keep sovereign bond yields among its country members in line with each other as the ECB prepares to raise interest rates for the first time in over a decade. Staff Economist Thomas Wash discusses this challenge for the ECB and the implications for investors.