This also applies to immigrants from third world countries as well as those who immigrate to Canada during the tax paying years of their cycle of life. Immigration has such a positive impact that it is often seen as a potential source of funds to help finance the country's future spending associated with pay-as-you-go systems, such as public pensions and health care. They contribute to expenses that become increasingly necessary with an aging population. According to Canadian studies, this suggests that immigration will not change the age structure of the Canadian population, which will not change the need for this kind of spending as we age..