When he encountered a wave of enemy resistance to this attack, he stuck to his position without regard for his safety or reputation and gallantly invoked the law of supply and demand.
There are no more uses of "supply and demand" in the book.
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The average stay for an Unwind is three weeks, although it varies depending on blood type and supply and demand.
Neal Shusterman -- Unwind
"It’s as if we expect border control agents to do what a century of communism could not: defeat the natural market forces of supply and demand and defeat the natural human desire for freedom and opportunity," noted New York mayor Michael Bloomberg told Congress.