“…In fact, the findings on the relationship between job demands and performance to date are mixed. Some studies have found negative relationship between job demands and job performance (e.g., Beehr, Jex, Stacy, & Murray, 2000), others have not found any significant relationship (e.g., Glaser, Tatum, Nebeker, Sorenson, & Aiello, 1999), and still others have reported a positive relationship (e.g., Spector, Dwyer, & Jex, 1988). Empirical support for the inverted Ushaped relationship between job demands and job performance is very limited in the job stress literature (Rosen et al, 2010).…”