In economics, supply and demand describes market relations between prospective sellers and buyers of a good. The supply and demand model determines price and quantity sold in a ...
http://en.wikipedia.org/wiki/Demand

Demand Media TM is building the leading vertical media network and world's largest content and social media marketplace connecting content creators, users and publishers on a mass ...
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verb (used with object) 1. to ask for with proper authority; claim as a right: He demanded payment of the debt. 2. to ask for peremptorily or urgently: He demanded sanctuary.
http://dictionary.reference.com/browse/demand

Encourages the design and manufacture of equipment for disabled people and provides specially designed equipment.
http://www.demand.org.uk/

Demand Products provides EIFS tools and supplies, foam hot wire cutters, hotwire tables, AAC and ICF supplies, roof flashings.
http://www.demandproducts.com/