Nov 29 (Reuters) - Canada's main stock index opened flat

on Friday in thin trading volumes, while investors assessed

gross domestic product data that reinforced expectations of the

Bank of Canada implementing an interest-rate cut next month.

At 9:31 a.m. ET (1431 GMT), the Toronto Stock Exchange's

S&P/TSX composite index .GSPTSE was down 10.68 points, or 0.04%,

at 25,532.84.