In most countries, there is a mix of all five models, but this varies across countries and over time within countries. Aside from financing mechanisms, an important question should always be how much to spend on healthcare. For the purposes of comparison, this is often expressed as the percentage of GDP spent on healthcare. In OECD countries for every extra $1000 spent on healthcare, life expectancy falls by 0.4 years. A similar correlation is seen from the analysis carried out each year by Bloomberg. Clearly this kind of analysis is flawed in that life expectancy is only one measure of a health system's performance, but equally, the notion that more funding is better is not supported.