Utilize the input text as a context reference, choose the right relationship between Betfair and online gambling 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.

Betfair and Irish rival Paddy Power have agreed in principle on a 5 billion pound ($7.85 billion) merger to stake a claim to leadership of the online gambling market in Britain.

Answer: industry