Our capacity to record information has increased exponentially over time while the longevity of the media used to store the information has decreased equivalently. Example: Tablets that last thousands of years vs SnapChat with lifespan of 10 Seconds http://www.clir.org/pubs/reports/conway2/index.html
http://www2.econ.iastate.edu/classes/econ355/choi/bab.htm