Supply-Side, Demand-Side & the Entrepreneur

The amount of good in the market is the supply and the amount people want to buy is the demand⁽¹⁾.
Supply-side economics argues that economic growth can be most effectively created by lowering berries for people to produce goods and services (tangible and intangible).  It argues that tax reduction leads to increased investment, and to increased production which yields stronger economy.

Demand-side economics (Keynesian economics) argues that a mixed-economy, where private sector along with a moderate role of government and public sector co-exist can lead to economic growth - in other words, "demand creates its own supply" ⁽²⁾.
There is a fine balance between the two.  The supply-side economics claims that "supply creates its own demand" (Say's Law)⁽³⁾.   A demand-side economics creates a preference of what actually people want, but in doing so people deny themselves all other options ⁽⁴⁾.   The goal is to strive for a balance where supply and demand meet an equilibrium where maximum utility, which is the consumer satisfaction from the consumption of goods or services, is reached.
In accordance to the law of diminishing marginal utility which says with increased consumption, satisfaction decreases, a mixed-economy will not be able to sustain its growth without innovation.  An entrepreneur's understanding of both supply-side economics and demand-side economics guides him towards formulating "product, service, idea and innovation", where customers drive innovation (which is defined as development of a specific product, service, idea, process, or environment, with the intent of commercializing it and extracting value or utility from that commercialization⁽⁵⁾).

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1 - http://www.sciencedaily.com/articles/m/microeconomics.htm
2 - Bartlett, Bruce. "Supply-Side Economics: "Voodoo Economics" or Lasting Contribution?" (PDF). Laffer Associates (November 11, 2003). Retrieved 2008-11-17.
3 - http://en.wikipedia.org/wiki/Supply-side_economics - p2
4 - http://en.wikibooks.org/wiki/Microeconomics
5 - Dr. Oster, http://www.regent.edu/admin/media/fms/butterfly/butterflyURL.cfm?address=5000111