"Complementary currencies work in addition to existing money, rather than replacing existing, official money. There are whole different families of complementary currencies. One of them is local currencies. One is regional currencies. Another is functional currencies. Another is social-purpose currencies."

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Capital, and the question of who owns it and therefore reaps the benefit of its productiveness, is an extremely important issue that is complementary to the issue of full employment... I see these as twin pillars of our economy: Full employment of our labor resources and widespread ownership of our capital resources. Such twin pillars would go a long way in providing a firm underlying support for future economic growth that would be equitably shared.

— Hubert H. Humphrey