I've considered that question. I'm not an economist. I've talked to Mr. Mintz about that, because he wrote that paper. It probably varies because of the tax level in each respective province as well. I think there should be an upper limit of some sort, because people, after a certain point, don't need that incentive to assist them with poverty or for low income. Lower-income people actually need that incentive.
On May 28th, 2009. See this statement in context.