Utilize the input text as a context reference, choose the right relationship between Mattel and toy industry 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.

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