"The reason expected future real rates are low is that monetary policy has responded and is expected to continue to respond appropriately to persistent forces weighing on demand and inflation.
"These developments, if they prove persistent, could weigh on the outlook for economic activity and the labour market," Ms Yellen wrote in a statement.
The yen, whose persistent strength weighed on Japan's important export sector for years, has fallen, making Japanese goods more competitive.
The state's persistent drought, although weighing heavily on residents, doesn't appear to bother travelers interested in sunshine, shopping and sightseeing.
The persistent criticism and scrutiny are clearly weighing on Thomas.
Mr Carney also warned that "persistent headwinds continued to weigh on the UK economy", which would mean more gradual increases in interest rates than previously.
Mr Carney warned on Wednesday that "persistent headwinds continued to weigh on the UK economy", which would mean more gradual increases in interest rates than had previously been the case.
There is a persistent rumour that the Birkenhead was carrying a military payroll of £240,000 in gold coins weighing about three tons, which had been secretly stored in the powder-room before the final voyage.
Molecular biologist Richard Ebright of Rutgers University, New Brunswick, a persistent critic of U.S. biodefense research, says the rules don't require "a bona fide risk-benefit analysis," which would require weighing risks and benefits, not just identifying them.
But there are considerable forces weighing against his conservative advice, particularly when patients have had an accident or an injury on the job, and stand to benefit financially from persistent disability.
