Traders work on the floor of the New York Stock Exchange shortly after the opening bell in New York Dec. 17. Traders work on the floor of the New York Stock Exchange shortly after the opening bell in New York Dec. 17. Canada's main stock index slipped on Thursday as telecom stocks weighed after Shaw Communications Inc said it planned to jump into wireless with a $1.6-billion bid for recent entrant Wind Mobile. Shaw fell 8.8 per cent to $24.59 as investors fretted about how it would finance the deal, while its main rival in Western Canada, Telus Corp, lost 8.5 per cent to $37.18 on an expectation of intensified wireless competition.