2970
Oil exporters have a lot of useful ways to spend the money , '' said Kenneth Rogoff , a professor of public policy at Harvard University and a former chief economist at the I.M.F. And the Middle East 's apparent frugality may just reflect the difficulty of spending such a large windfall quickly .
 person of company: Kenneth Rogoff, Harvard University
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
Answer:
 person of company: Kenneth Rogoff, Harvard University