Season 5, Episode 5: Samuel Tarly was able to kill a white walker using dragon glass, but neither he nor Stannis Baratheon know why. Sam is reading to try to figure out more. Here is a case where research and development could yield results that help society. This is similar to what companies and governments face – where investments in research could lead to increases in profits or other benefits. Graphically, a new use for dragon glass should cause an increase in productional possibilities, and this could be represented by a shift in the PPF.
