I don't see any contradiction. Re-phrase it: if an economy is not growing, it can't involve all citizens; and the only way to grow is to involve all citizens. They're surely two propositions which can stand together? Basically, they say that if you don't involve all citizens, you're in a vicious cycle, as you won't grow and won't be able to involve them all. But if you do involve all citizens, growth might (but not necessarily will) ensue.

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Money won't buy you friends. But it gets you a better class of enemy.
Spike Milligan