Finland seems to be going into serious salary inflation in these years. The same is true for many other new countries in EU, e.g., Poland and Estonia. Why? The reason is that the labor in these countries have had, for historical reasons, lower salaries than in western parts of EU. After joining EU, workers are free to move to other EU countries with better salary levels.
This is a natural cause for inflation. To prevent people from leaving, the salary levels have to rise to a common level. The problem here is within the process. First, the salary level of the labor of export industries rises, as the customers are in countries with better salaries. Thus, their customers can afford to pay more. A second group are the professionals of some highly contested (employer level) fields, like surgeons, CEOs, and other such people.
The trouble is that within the domestic industry (selling their products domestically) and domestic service industry (including public health care), the customers are the local people who have less money to spend than the customers of the export industry. Of course, the salary levels of the export industry rise, but slowly. In the same time there is a need for service industry professionals, most notably nurses, abroad. As almost all of Europe is, in reality, facing a shortage of labor due to too low birth rates, these nurses are being sought after to jobs abroad.
Now the Finnish nurses are going to do mass resignations with an intention to force a rise to their salary level to the same level as their Swedish colleagues get. The problem here is that their paying customers, the majority of taxpayers, do not get the same high wages that their colleagues abroad get, so they do not afford paying that much.
The results of this kind of development are even more evident in countries with even a bigger gap to close, e.g. Estonia. For Estonians, there is almost always a possibility to go to work in Finland with a quadruple salary. Many professionals do so. But that does not mean that the remaining people can afford the prices (or taxes) needed to make possible paying the same level of salaries to these people in Estonia. Because of loss of labor, the salary levels rise fast in Estonia, especially in Tallinn.
An counterexample happened in the former DDR (East Germany). There the wage level rose to the West Germany's level overnight. The result was destruction of almost all of the industry in the country, as the old and mostly obsolete machinery could not be put to produce such turnover that these wages were possible - not after the border disappeared and the people had a chance to buy western, cheaper and better, products. Of course, there was little possibility of keeping the old price level, either, as that would have resulted in the mass movement of the people to West Germany for better wages. The result has been, however, such a movement as the collapse of the DDR's industry has destructed the jobs in the East. Especially the younger people have moved west to find jobs.
Reaching an equilibrium will be painful. For the Finnish pulp&paper industry, it has taken the entire lifetime of the industry, more than 100 years, to catch the salary levels of Sweden. The Finnish nurses want to reach the level in 2.5 years. Huh. Maybe I should, as an engineer of private sector in Finland, ask a 50% increase to catch my Swiss colleagues, too.
As a bottom line one should be patient with the slow speed that the salaries rise. The wages of the domestic service industry should not rise faster than the purchasing power of the local people. This is, of course, difficult when there is a shortage of labor. Why should people take lower paid jobs in the services if there are better paid export industry jobs available?