What is a butter mountain EU?

The "butter mountain" refers to the European Union's policy of creating large stockpiles of butter in the 1980s due to overproduction and price support measures. This situation arose when the EU implemented common agricultural policies that encouraged farmers to produce more milk, leading to surplus butter that the EU had to store. The term symbolizes the inefficiencies and unintended consequences of agricultural subsidies, prompting reforms in EU agricultural policies to prevent such overproduction in the future.