22332
 I think the biggest single way it 's affected the U.S. economy is that investment levels in Japan and Europe are very low and that 's keeping global interest rates low , '' said Kenneth Rogoff , a professor of economics at Harvard University . 
 Kenneth Rogoff, Harvard University
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
Answer:
 Kenneth Rogoff, Harvard University