Abundant information wants to be free. Scarce information wants to be expensive.
In this case we’re using the marginal cost construction of “abundant” and “scarce”:
Information that can be replicated and distributed at low marginal cost wants to be free; information with high marginal cost wants to be expensive.
So, you can read a copy of this book online for free, but if you want Chris Anderson to flight to your city and prepare a custom talk on free as it applies to your business, he would be happy, but you’ll have to pay him for his scarce time.
From Free, by Chris Anderson