The jury is still out on the impact of negative interest rates, according to John Kingston, director of global market insights at S&P Global. S&P recently released a report looking at unconventional monetary policies, noting in its findings that 'the scale of negative policy rates has reached unprecedented levels.' The report found that negative rates are working better in Europe than Japan, but that leaving negative rates in place for too long could be damaging to the financial sector. Kingston noted that negative rates have presented a challenge for asset managers, who now look at investments that they may not have in the past, as they try to generate yield for investors. In the meantime, S&P expects the U.S. Federal Reserve will move forward with another rate hike before the end of the year.