Utilize the input text as a context reference, choose the right relationship between Janet Yellen and economist from the options. Options: 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.

St George chief economist Hans Kunnen said prices in most major bond markets were little changed after the comments from US Fed chair Janet Yellen "added no fresh insights into monetary policy thinking", and reiterated a US interest rate rise is likely in 2015.

Answer: position_held