
According to data from the White House (here and here), the graph below shows that the purity of powder cocaine more than doubled between the early 1980s and the 1990s and after.

Exhibit A: The original drug of choice made from poppies in the 1800s was opium, but after it became illegal, the market for heroin was born, which is made from opium/morphine.
Exhibit B: During prohibition in the U.S. during the 1930s, most illegal "moonshine" was the strongest possible alcohol like "bathtub gin," etc. Nobody bothered making illegal beer or wine, everybody wanted the strongest, purest alcohol possible.
Exhibit C: Going from powder cocaine to crack cocaine in the 1980s and 1990s, to get more "bang for the buck."
Top graph HT: Pete Boettke
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