Utilize the input text as a context reference, choose the right relationship between Mattel and board game 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 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: product_or_material_produced