Parkinson's Law of Data: prov. "Data expands to fill the space
available for storage"; buying more memory encourages the use of
more memory-intensive techniques. It has been observed since the
mid-1980s that the memory usage of evolving systems tends to double
roughly once every 18 months. Fortunately, memory density available
for constant dollars also tends to about double once every 18 months
(see Moore's Law); unfortunately, the laws of physics guarantee
that the latter cannot continue indefinitely.
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