generate questions: A global city, Boston is placed among the top 30 most economically powerful cities in the world. Encompassing $363 billion, the Greater Boston metropolitan area has the sixth-largest economy in the country and 12th-largest in the world.
What rank does Boston hold as far as being an economically powerful city in the world? {sep_token} What is the economy of Boston? {sep_token} What ranking in the country does Greater Boston metro hold as far as economy? {sep_token} What ranking in the world does greater Boston metro hold as far as economy? {sep_token}