Reliance on this law, which was approximately true at the time, led to the concept of “economy of scale”, i.e. that large computers were less expensive per operation than small computers. Since that time other values of the exponent have been suggested: a good case can be made for the value 1 rather than 2. Current (LSI) technology has almost completely invalidated Grosch's law.
"Groschs law." A Dictionary of Computing. . Encyclopedia.com. (August 15, 2018). http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/groschs-law
"Groschs law." A Dictionary of Computing. . Retrieved August 15, 2018 from Encyclopedia.com: http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/groschs-law