Where do the pigs get money to purchase whiskey animal farm?

In George Orwell's "Animal Farm," the pigs acquire money to purchase whiskey by engaging in trade with human farmers. They sell timber and other products from the farm, which allows them to generate income. The pigs, particularly Napoleon, prioritize their own desires and use the farm's resources for personal indulgences, such as buying whiskey, while the other animals continue to work hard and face shortages.