Possibility of hike in interest rates in the U.S. next year, deflationary worries in the Euro zone, slowdown in China, and moderation in Japanese growth might trigger off market volatility in the near term (read: 'High-Quality' ETFs for Long-Term Outperformance ). State Street seems enthralled by the 'quality' theme in ETF offerings. Notably, more than 50% of its offerings this year revolve around these 'quality' characteristics.