Certainly. I'll try to address both parts of your question and maybe even ask my colleagues to jump in.
The first thing we do is to get a couple of hundred food items from each of the major grocery chains out there. We get millions and millions of actual prices and quantities of what people are buying sent to us at Statistics Canada. When that can of beans or that pot roast or whatever it is goes across the scanner, we get a copy of that. Then, as I mentioned earlier, based on the weights of what people are consuming, we determine the price change for the same quantity adjusted for that quality difference, and then we come up with the price of that.
We look at food, non-alcoholic beverages and meat specifically. We have breakdowns of those. For example, meat makes up about 2.3% of the weight of that basket, and we know that's gone up 9% year over year. Month to month, it actually dropped 0.4%. Some things have gone up but fresh vegetables, for example, have actually gone down.
The second part of your question was what the determinants are. Weather, no surprise, is a major determinant of what's going on. When we've seen droughts, the slaughter prices have gone up, and of course we saw a big shift there as nobody could feed their livestock, so we saw increases. Weather is a major factor.
The input costs—fertilizers and so on—are based on the price of fuel and so on. As we see changes in those, we'll see changes creeping up into the food costs. You mentioned supply chains, and, of course, we know that a certain portion of our goods are from the States, for example, or are imported. Those are the factors there.