What is the relationship between Janet Yellen and economist in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

Kevin Lamarque | Reuters Janet Yellen "A weaker-than-expected rise in consumer prices at the start of Q3 further fuels the dovish argument for the Fed to remain on the sideline, delaying liftoff beyond the September FOMC meeting," Lindsey Piegza, chief economist at Stifel Fixed Income, said in a note.

Answer: position_held