On the upside, shares in mid-cap Betfair soared 17 percent after the online gambling company and Irish rival Paddy Power said they had reached an agreement in principle on a possible merger, marking the latest in a string of possible tie-ups across the sector.
Refer to the input text as context and select the correct relationship between 'Betfair' and 'online gambling' from the available options.
Options: industry, brand, creator, member of