Demand vacuum in economics and marketing is the effect created by the consumer demand on the supply chain. The term refers to an analogy of consumer demand for a product or service that creates a “vacuum” at the end of the supply chain which “pulls” the product through the chain of supply.
The marketing strategy of a strategy to reduce demand for a vacuum through advertising and promotion to the consumer. This is to be compared with a push to push the product through the supply chain and to promote it. 
A vacuum can cause has asked local shortage of a product When local demand is far exceeded by demand in export markets. The result is a product of a product in its originating market.
- Jump up^ Philip Kotler, Gary Armstron,Principles of Marketing, p. 442, Pearson Education, 2010ISBN 0137006691.