The paper looks at how joining the European Union affected Poland's trade policies. The EU's rules had a big impact on how Poland traded with other countries. Even though it was hard for Polish businesses to adjust to the new rules, the benefits of following EU trade policies outweighed the costs. Overall, the new trade system helped increase trade and foreign investment in Poland. Poland had to give up some control over its trade policies, but in return, it got to help shape the EU's trade policies.