In simple terms, it was a series of tariff barriers and import restrictions designed to protect the interests of Stilan's domestic farmers and landlords.
The law stipulated that when the domestic grain price in Stilan was below a certain market price, the import of foreign grain was prohibited. When the price rose above that threshold, high tariffs were imposed on imports.
The practice of artificially maintaining high grain prices through such Grain Laws was not uncommon in the reality Wu Chang lived in.
Several island nations neighboring Xia Country were well-versed in this, with the soaring rice prices in Sakura Island and the exorbitant prices of fruits and vegetables in Stick Island being the results of similar manipulations.
This practice ensured the income of landlords but led to an increase in the cost of living for the people.
