Imagination Age is frequently conflated with imagination economy and should not be. The designer Charlie Magee used “The Age of Imagination” in a 1993 essay, and the term was popularised from 2007 onward, chiefly by the cultural critic Rita J. King.
The distinction matters. An age is a period, named by its dominant character. An economy is a structure, named by its scarce input. The first is a description of atmosphere; the second makes claims about where value accrues and why.