2012 Nobel Prize for economics winner Alvin Roth's work is more than just supply and demand. The system he came up with led to a computer matching program that has been applied in hospitals and, as a result, "nearly 2,000 patients have received kidney [...] that would otherwise not have received them"
"In 2003, the year before the system was implemented, there were just 19 kidney transplants from live donors in the United States nationally [sic]. That number rose to 34 when the system was introduced in 2004. Last year  it reached 443."
What an awesome wave! Read more about this system and the New England Program for Kidney Exchange (NEPKE), a scheme Roth helped found, here.