Yes, this is Jeff. Within the store environment in the US and in many countries around the world, it can be challenging on multiple line items, and labor is certainly one of them. When you look at the -- our corporate store margins for the year, they were pressured pretty significantly on labor rate, now the operator of that business, great teams and the market that we're in, did a really nice job of generating some efficiencies, but it wasn't enough to overcome the increase in labor rate and labor rates really two-forms. One is government-mandated labor rate increases, which of course we follow, but also just that the fact that the economy as you know, is white hot right now, in the US, everybody has got a job and sometimes the economics of the situation demand that labor rates go up. So really, really don't have an opinion or care as to why it goes up, but we need to do it, to continue to drive those efficiencies. And there are opportunities there, I think for us to continue to chase that, we're investing more in technology inside the store, we certainly done a great job with consumer facing, the point of sale, things like that. But we're really taking a fresh look at how we can use technology kind of behind the counter for labor scheduling for our corporate stores, sharing best practices to the extent that the franchisees who obviously make their own decisions in this regard, can learn from that. But yes, always opportunity in margin, labor, all of the big opportunity. And I think as we go forward, driving the volume, driving that traffic will give us a better chance, an increase in dollar profit there. But, it is difficult environment with labor, but we just got to continue to work our way out of that.