Passage: Several statistical studies support the theory that a higher degree of economic freedom, as measured with one the several Indices of Economic Freedom which have been used in numerous studies, increases economic growth and that this in turn increases general prosperity, reduces poverty and causes democratisation. This is a statistical tendency and there are individual exceptions like Mali, which is ranked as "Free" by Freedom House, but is a Least Developed Country, or Qatar, which has arguably the highest GDP per capita in the world, but has never been democratic. There are also other studies suggesting that more democracy increases economic freedom, although a few find no or even a small negative effect. One objection might be that nations like Canada and Sweden today score just below nations like Chile and Estonia on economic freedom, but that Canada and Sweden today have a higher GDP per capita. However, this is a misunderstanding as the studies indicate effect on economic growth and thus that future GDP per capita will be higher with higher economic freedom. Also according to the index, Canada and Sweden are among the world's nations with the highest economic freedom rankings, due to factors such as strong rule of law, strong property rights and few restrictions against free trade. Critics might argue that the Index of Economic Freedom and other methods used does not measure the degree of capitalism, preferring some other definition.

Question: Those who are critical of the Economic Freedom Index think it fails to quantify what economic system?
capitalism