The
humble potato – drought-resistant, able to thrive in diverse soils, and
enjoyed fried, steamed or baked – brought centuries of relative calm
and prosperity to Europe after its introduction in the 16th century, a
new study says.
The crop, discovered in Latin America in the 1400s
before eventually sweeping through Europe, greatly boosted productivity,
helping lower land costs while improving nutrition and raising wages,
from peasants up to the ruling classes, according to the study for the
National Bureau of Economic Research.
The blessings that flowed from
this agricultural revolution helped ease the economic and societal
pressures that can lead to costly and disastrous conflicts, says the
report.
The introduction of potatoes and the resultant increase in
productivity “dramatically reduced conflict” both within and between
states for some two centuries, it says.
The researchers, who examined 2,477 battles fought in 899 wars over a 500-year period, drew two key conclusions.
The first is linked to the declining value of land on which potatoes are grown.
According
to the study, the value of the land on which potatoes were grown fell
with advances in productivity. Populations were able to feed themselves
on ever smaller amounts of land.
“Conflicts declined when the value of the object for which one was fighting decreased,” the study says.
Meantime,
increases in farmers’ incomes, often due to much bigger and more
reliable harvests, boosted tax revenues for the state, providing added
governmental stability and thereby helping to “buy” the peace, the
report states.
To risk losing these resources – for workers and for
political leaders – represented a financial danger that states were less
and less willing to risk, resulting in “a decline in peasant revolts
and civil wars,” the study said.
It had become “too expensive to engage in combat.”
The
analysis does not detail the impact of specific wars or conflicts but
says that most of those studied took place on the borders of modern-day
Austria, France, Russia and Turkey. Others were in the Near East and
North Africa.
The potato was selected for the study because it can be
grown in many types of soil and is resistant to “drought shocks,”
researchers say, while other vegetables cannot be grown in conditions as
hot or cold.
Cultivation of the potato improved nutrition in
periods of cold or drought, helping ease the pressures of supporting
growing populations, said Murat Iyigun, one of the study’s authors.
The study’s conclusions square with previous research on the link between climate shocks and a country’s entry into war.
“The
climatic shocks observed over time, like rough winters, have tended to
favour the emergence of conflicts,” said Iyigun, a University of
Colorado professor. “People have had to fight to survive.”
Do these theories apply to the contemporary world? Partially, he said.
“One
of the keys to development, without risk of conflict, for the very poor
states still largely dependent on agriculture is linked to improving
and steadying the supply of their agricultural output.”
A potato field in Lobau, Austria.