No Shortcuts On the Path to prosperity
Last week, I heard about a particularly tragic example of the post hoc, ergo propter hoc logical fallacy, which Frederic
Bastiat, the great 19th-century economist, called “the greatest and most common fallacy in reasoning.”
After the outbreak of World War II, many
isolated islands located in the Pacific Ocean became staging grounds for Japanese
and Allied forces. This development unfolded before the primitive indigenous
peoples, including those on the island of Tanna, Vanuatu. According to Wikipedia:
The vast amounts of military equipment and supplies that both sides air-dropped (or airlifted to airstrips) to troops on these islands meant drastic changes to the lifestyle of the islanders, many of whom had never seen outsiders before. Manufactured clothing, medicine, canned food, tents, weapons and other goods arrived in vast quantities for the soldiers, who often shared some of it with the islanders who were their guides and hosts.
Sadly, this arrangement came to an abrupt
end with the end of the war, when the Allied forces abandoned these temporary
airbases. Once again, the islanders no longer had access to the myriad of
consumer goods provided by visitors from distant advanced economies.
As a result, on Tanna island and
elsewhere, local inhabitants formed so-called “cargo cults” in order to restore
their lost prosperity:
In an effort to get cargo to fall by parachute or land in planes or ships again, islanders imitated the same practices they had seen the soldiers, sailors, and airmen use. Cult behaviours usually involved mimicking the day to day activities and dress styles of US soldiers, such as performing parade ground drills with wooden or salvaged rifles. The islanders carved headphones from wood and wore them while sitting in fabricated control towers. They waved the landing signals while standing on the runways. They lit signal fires and torches to light up runways and lighthouses.
In a form of sympathetic magic, many built life-size replicas of aeroplanes out of straw and cut new military-style landing strips out of the jungle, hoping to attract more aeroplanes.
The indigenous peoples of Tanna island
observed that material goods arrived after the presence of landing strips and
aeroplanes. This led them to falsely conclude that
material goods arrived because of the presence of landing strips and
aeroplanes. They failed to consider other causal factors, such as the war, and
based their conclusion solely on the order of events. This is the essence of
the post
hoc ergo propter hoc logical fallacy.













