Moore's Law
Moore's law was specifically that transistor density was exponential and would double about every two years (Morville, 2005, p. 43; Rainie & Wellman, 2012, p. 62).
References:
Morville, P. (2005). Ambient findability. Sebastopol: O'Reilly.
Rainie, H. & Wellman, B. (2012). Networked: The New Social Operating System. Cambridge: MIT.