Weird choice to weigh the democratic index by the GDP. The 10 richest western countries make up for ~40% of the world GDP, but only ~9% of the world population.

I would understand not weighing by population as it would give too much weight to some countries, but the GDP does the same in a much worse way.

For the population, there is an reason for doing so: it gives the Democracy Index of an average world citizen. But for the GDP, it gives the Democracy Index of an average... US$.

Moreover, GDP (par capita) and Democracy Index are correlated, so it's problematic to weigh one by the other.