Click to get this free report SPDR-DJ IND AVG (DIA): ETF Research Reports NASDAQ-100 SHRS (QQQ): ETF Research Reports SPDR-SP 500 TR (SPY): ETF Research Reports To read this article on Zacks.com click here. During the latest June FOMC press conference, Fed Chair Jerome Powell was confronted with a question regarding the non-accelerating inflation rate of unemployment (aka NAIRU). The empirical evidence for the Phillips curve relationship offers mixed results that have especially in recent years not been very stable ( Consult last month's Zacks Economic report ).