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Chapter 5 IT Infrastructure and Emerging Technologies 203

FIGURE 5.6 EXAMPLE OF NANOTUBES

Nanotubes are tiny tubes about 10,000 times thinner than a human hair. They consist of rolled-up
sheets of carbon hexagons and have the potential uses as minuscule wires or in ultrasmall electronic
devices and are very powerful conductors of electrical current. © Tyler Boyes/Shutterstock.

FIGURE 5.7 THE AMOUNT OF STORAGE PER DOLLAR RISES
EXPONENTIALLY, 1950–2012

Amount of Storage Per Dollar (gigabytes)

12

10

8

6

4

2

0
1950 1955 1958 1959 1960 1970 1975 1980 1990 2000 2005 2010 2012

Since the first magnetic storage device was used in 1955, the amount of storage a dollar buys has
risen exponentially, doubling the amount of digital storage for each dollar expended every 15 months
on average.
Source: Authors’ estimates.

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