Take context from the input text and decide on the accurate relationship between 'Janet Yellen' and 'economist' from the options provided.
Options: position held, subsidiary, chief executive officer, location of formation

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.
position held