Among the candidates for entry into European Union there is a common perception that membership in the EU is going to accelerate economic growth of the aspiring member. Only two years have passed since ten countries have entered EU in 2004, too short a period to make any meaningful observations.
Instead, I attach the data about GDP/capita levels in members that have joined EU earlier (it was then called European Economic Community). Ireland became a member in 1973, Greece in 1981, Spain in 1981 and Portugal in 1986. Greek part of Cyprus joined in 2004.
The new members are supposed to benefit from at least two things:
1) integration into the huge free trade zone that EU is and
2) adjustment funds from the richer members
All countries mentioned were below 75% of EU average in GDP/capita and thus eligible for funds that would allow them to converge to it. Have they suceeded?

Ireland, known because of its later growth as the Celtic tiger, only picked up with growth in the last decade of the 20th century. This is despite being a destination of EEC adjustment funds for longer time than any other member.

Spain expirienced solid growth after its EEC membership, which is often mentioned as case in point of membership accelerating economic growth.

Portugal has started from a very low level, had some good growth which seems to have dissapeared in 2000. I don’t know the cause, but until then Portugal and Spain seemed to follow a similar growth pattern.

Greece not only failed to converge to the EU average, but actually diverged for a period. This has been a mystery for analysts. Greece has had relatively large military and social expenditures and it accumulated a lot of debt under the socialist government but that is not enough to explain the lag. Greece has also been a reciever of generous EU funds.

Cyprus is the control country
. It especially lends itself to comparisons with Greece. Whatever be the cultural influences on economic growth they cancel each other in this case since both countries are populated with Greeks. The difference in economic performance can most likely be attributed entirely to differences in economic policy.
What can one conclude from all this? Not too much, of course. Every country has its own story to tell (I might cover some of them in more depth in subsequent posts) but the least we can say is that strong economic growth is possible for a European country without membership in the European Union. As for how much the membership helps growth, I’d say that the jury is still out. EU has literally thrown billions at Ireland, Portugal and Greece (my favourite example, thank you Greece for not growing for a period
), with mixed results. Ireland is now at 40% above the average EU GDP/capita, but the case of Portugal and Greece (both at about 20-25% below it) is far from spectacular.