What is the relationship between Mattel and toy industry 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 the toy industry is fickle and the hot toy of today is the forgotten toy of tomorrow, Mattel has a portfolio of brands that have been around for decades, including Barbie, Hot Wheels, and Fisher-Price.

Answer: industry