Utilize the input text as a context reference, choose the right relationship between Justin Wolfers and University of Michigan 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.

University of Michigan economics professor Justin Wolfers says monetary policy in the current environment is a debate between the theory and facts.

Answer: employer