Finally, the political changes of great depth and rapidity that have taken place in recent years, related to the rise of nationalism and xenophobia, protectionism and the rise of radicalization and extremism, may have their origin, among other phenomena, in the increase of real or perceived inequality, not only within a given country (disaffection between the poor and working classes with political and economic elites), but also between different countries (the relative improvement of income among the middle classes of emerging countries, in the face of the fall of income among lower-middle class households who have seen their jobs in mature industries going to other countries).
A háttér-koncentrációk átlagos értékét a mintavevő zsákos módszerrel vagy folyamatos méréssel és integrálással lehet meghatározninot-set not-set