I think there are a number of reasons. Adherence is a factor, so it's not just not filling prescriptions. Not taking some of the medicines that people have collected is also a significant problem. Many organizations, including us and Pharmac, have turned our minds to this.
I think some of those issues are cultural; people are often reluctant to take medicines, even if their general practitioner has encouraged them to do so. Some people would say that costs are significant, and there were comments previously about the copayment being a barrier, but I don't think it's a significant problem. When you look at the copayments that exist in other countries that have similar health care systems, they are significantly higher.
I think there is a rank of reasons. It's difficult to grapple with. Sometimes it's just the fact that people don't really like taking medicines unless they feel they really have to. It's an educative process that's required, rather than a problem that is caused by the type of system that we have.