What is the relationship between Mattel and Barbie in the context of the input sentence. Choose an answer from: 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.

While Mattel has struggled to boost flagging sales of its iconic Barbie dolls, Hasbro's tie-ups with movie studios have been a money-spinner for the Monopoly board game maker.

Answer: owner_of