From Poland: The First Thousand Years, by Patrice M. Dabrowski (Cornell University Press, 2014), Kindle pp. 166-169:
That Poland-Lithuania was able to rein in the natural inclination of monarchs to seek absolute power was partly the result of the country’s unique political heritage and traditions and partly the result of a unique period of efflorescence, one reflected not only in the degree to which Renaissance ideas penetrated the polity but also in the economic well-being that accompanied the Golden Age….
This Golden Age was no misnomer. Not that Polish miners had suddenly discovered a rich vein of gold. The market for gold and silver bullion was dominated by Spain, whose recent penetration of the New World had uncovered vast new supplies of these precious ores. Poland-Lithuania turned out to have ample reserves of a resource that was in great demand elsewhere in the world: grain.
The particular world conjuncture of the late fifteenth century suddenly upped the ante for the grain trade. The Black Death of the mid-fourteenth century (which, incidentally, never made its way to Poland) had a significant effect on the economy of the countries in Western Europe, which upon rebounding shifted from agricultural production to animal husbandry. The population increase in the growing cities of the West, combined with the conscious decision to raise sheep for wool instead of planting seeds for grain meant that food was at a premium—a situation reflected in the so-called price revolution, which suddenly made it exceedingly profitable to engage in the export of staple foods.
It so happened that Poland-Lithuania was perfectly poised to take advantage of this situation. Not only did these lands have ample fields of grain. They now could profit in full from exporting their grain surplus via the Baltic. How? Because Poland-Lithuania now had an outlet to the sea. In earlier centuries, the Teutonic Knights had dominated the Baltic Sea coast and, with it, all sea-bound trade. This changed in the mid-fifteenth century when the population of Royal Prussia—including cities such as Gdańsk and Elbląg—opted for Polish rule. One long (thirteen-year) war and peace treaty later, Royal Prussia became part of Poland-Lithuania. After the mid-fifteenth century, the Teutonic Knights had to content themselves with the less fertile and less developed lands to the east; and even those lands, known after 1525 as Ducal Prussia, became a fief of the Crown of Poland.
In exchange for their allegiance, the inhabitants of Royal Prussia were given several important political and economic privileges. These included the right to their own regional parliament (the Prussian estates), municipal self-government for the cities, the right to trade everywhere in the vast country, and exemption from any additional tolls on the Vistula. The region’s incorporation into Poland-Lithuania, thus, had the potential to bring much benefit to the state. Gdańsk merchants could contract for Polish grain, and those supplying the grain had recourse to the growing world market for their staples, the easiest commodity for a large lowland country to produce. The result was that in the sixteenth century Poland became the main supplier of grain to Europe. Each fall, tons of golden grain—oats and rye, wheat and barley—were shipped to markets far and wide. Whereas in the year 1490, around twenty thousand tons of rye were exported, for example, nearly a century later (in 1587), the figure had risen to around seventy-one thousand tons.
Some of the grain went to destinations within the Baltic region—to places such as Lübeck or Copenhagen, Stockholm or Riga. The other (larger) half sailed through the sound. Some of the grain ended up not only in Amsterdam but also in places such as Setubal or Faro in Portugal, or even all the way to the Mediterranean.
Among the greatest consumers of Polish grain were the Dutch. Those mighty world traders hailing from a tiny waterlogged flatland could no longer feed themselves. Gdańsk itself was responsible for half of Amsterdam’s Baltic trade. But the Dutch were hardly the only foreigners present in the port Gdańsk. Germans, Frenchmen, Flemings, Englishmen, Spaniards, Portuguese, all traveled to this Baltic entrepôt in search of what Poland-Lithuania could supply. They found a sea of warehouses bursting with rye, wheat, and other grains as well as fibers (flax and hemp), forest goods (wax, honey, potash, lumber), even salted beef.
All this earned the Gdańsk merchants and their Polish suppliers a pretty penny. In the early years of this increased Baltic trade, a foreigner noted what he observed during the annual two-week long fair in Gdańsk, which began on Saint Dominic’s feast day (August 4). He saw over 400 ships arrive in the port. Yet their holds, albeit awaiting the harvest of grain, were hardly empty. They had brought to the shores of Poland-Lithuania all manner of luxury items: French wines; Spanish olive oil, lemons, preserves, and fruits; silks and other fine cloths; Portuguese spices; English cloth and tin. Reportedly the first eight days of the fair were spent loading the boats of the foreigners with Polish-Lithuanian wares, the next eight with selling luxury items (some clearly of global provenance) to the Poles. Business was booming. By mid-century, the historian Marcin Kromer was reproaching his compatriots in the Kingdom of Poland for being obsessed with luxury and splendor, and for adorning themselves in foreign fabrics and exotic leathers, in silks and purples, silver, gold, pearls, and gemstones.
Far Outliers 