Utilize the input text as a context reference, choose the right relationship between MasterCard and Financial Services 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.

In 2007, Americans used an estimated 694.4 million credit cards with Visa Inc, MasterCard Inc, American Express Co and Discover Financial Services logos, according to industry data.

Answer: industry