Yes. It's not hard to do. The Department of Finance gives a request to the Canada Revenue Agency for certain types of information. They can even bring in some good academics to work on it—someone like Michael Veall, who is a witness today.
Let's try to understand how migration is impacted. It's not going to happen in a year, when you change the tax rate; it's something that could take two to three years before you see the migration. You need to understand more of the dynamic effects to understand it more. That's why I think it's an issue that we really haven't had a good study on to fully understand, at the top end, how sensitive people's residency is to changes in tax rates.