Freebase(0.00 / 0 votes)Rate this definition: Derived demand is a term in economics, where demand for a factor of production or intermediate good occurs as a result of the demand for another intermediate or final good.
10 best places to see this summerâs solar eclipse. On August 21st, a total solar eclipse will be visible to mainland America. Find out why it is drawing giddy excitement from the public, as well as astronomy gurus. On Aug. 21, a swath of the USA will plunge into darkness during a continent-wide total solar eclipse.
Solar eclipses occur only at a new moon, when the moon passes between the earth and the sun: the moon is entirely backlit and so it's visible only as a shadow. (You can actually see it a very little bit due to earthshine, the light reflected by the earth, onto the moon, and then back.)