A ballot measure that would increase the sales tax to pay for light rail maintenance and operations and bus rapid transit in Vancouver was the topic of a live chat on The Columbian’s website on Thursday.To replay the live chat, click here. Former Vancouver Mayor Royce Pollard shared why he supports the measure, while Kelly Parker, president of the Greater Vancouver Chamber of Commerce, discussed opposition to the measure. C-Tran spokesman Scott Patterson also participated in the live chat. Proposition 1 would increase sales tax in the C-Tran district by 0.1 percentage point. That’s an extra penny on every $10 purchase.