The EU establishes policies every of its member has to/should abide. Without doubt many of these are well intended. Without doubt the EU promotes peace, security, economical stability and a series of many other goals.
However, making good and fair policies is hard. Creating a perfectly fair environment is already (near) impossible on a small scale. So I can easily believe that on a large scale, like Europe, it's even more difficult. Thus I would expect, that there are policies which were knowingly made, that they would be beneficial for one country, but not necessarily for another.
Speaking out aloud these discrepancies however, gives the opporunity to address and factually improve them. What is fine and working today, might not be fine and working tomorrow. Thus I am very interested finding responses to the following two questions:
What are examples for such policies?
Have there been cases where countries were trading such advantages/disadvantages, (here we are entering economics, optimisation and game theory).
I do not intend to form a judgement on these policies. This question takes just a very narrow, local look at these policies. Without knowing more, especially context or all policies together, a proper judgement might not even be possible. Politics on such a level is incredible difficult. (And likely out of the scope of Politics Beta.)