Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: 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.

The downside reflects sluggish economic conditions and lack of innovative schemes for brand awareness and brand innovation, which have been dampening point of sale (POS) momentum.Also, sluggish performance of Barbie has been a matter of concern for Mattel since the beginning of 2013.

Answer: owner_of: Mattel, Barbie