How can we link the two most important concepts for an analysis of modern s
ocieties, functional differentiation and social inequality? Systems theory
claims a primacy of functional differentiation in modern societies and reje
cts the assumption of a general structure of inequality. It claims, that ea
ch functional subsystem produces its own kind of inequality. Empirically ho
wever, there are links between different forms of inclusion into these subs
ystems, which lead to a general form of inequality. It stems from three pow
er resources: symbolic power (education), political power, and economic opp
ortunities, which are convertible, thereby generating a general structure o
f inequality. Given that these resources intersect in individuals' occupati
onal positions, I argue that 'occupation' turns out to be the crucial varia
ble to understand the relation between functional differentiation and socia
l inequality. Strategies of social closure and the monopolization of resour
ces constitute a principle of social structuration, which cannot be derived
from the concept of functional differentiation.