Perchè è trascurabile:
Now what exactly is the HDI? The one-line explanation is that it gives "equal weights" to GDP per capita, life expectancy, and education. But it's more complicated than that, because scores on each of the three measures are bounded between 0 and 1. This effectively means that a country of immortals with infinite per-capita GDP would get a score of .666 (lower than South Africa and Tajikistan) if its population were illiterate and never went to school.
http://econlog.econlib.org/archives/2009/05/against_the_hum.html
