Yeah, we could spent a lot of time on this Ralph. But I think, at a high level, I would summarize by saying that, first of all, just realized that from a structural perspective, the market, particularly with hospital acquisition of physicians and their ability to direct work into the hospital laboratory creates a competitive disadvantage for us, that does affect pricing, right? Because they get paid more, they have, in many markets, a dominant market position, and now they can dictate to the physicians that the lab work has to be sent there. So that’s one sort of structural impediment to this idea that we should be able to get sort of market rate increases every year. The second thing is, I think, your 6% unit price statistic is distorted when you think about the laboratory business because when you think of that for example, pharma, where you make get a 10% price increase on a drug that costs 50 time a typical lap encounter, that's going to heavily skew your overall assessment of price. If I look at healthcare services broadly, think about distributors, think about pharmacies, think about laboratories, think about home health, think about durable medical equipment, you're not seeing price increases, you're seeing price being flat to down and you are seeing contract negotiations leading to down pricing in a typical case. So, I'm actually very proud of what we've accomplished in unit pricing over this year and over the last several years, particularly this year with the contracts opening. And then the last comment I would make for better or worse is when you're seeing as offering a service that is readily replaceable by somebody else, it's just difficult to go in and say we should get a price increase when others can be switched in. All that said, I will say, we negotiating our contracts for cost-of-living increases, call it type increases, we don't get them every year, but they are part of our contracting strategy. And that's part of the reason that we are able to keep price -- unit price relatively flat over time. So, I hope that’s helpful and obviously, it's a very complicated topic. But those are some of the market dynamics that I think explain why. It's not just a simple proposition of we get a price increase.