Finnish wild berry industry does not really make sense. Imported cultivated berries set an effective price ceiling, which isn't high enough to hire Finnish workers. The ones you could hire are not productive enough, and the ones who could get the job done have better options.

There are similar issues in agriculture, hospitality, and construction. Many jobs are seasonal and require you to live away from home. And because the outputs are supposed to be affordable, they don't pay enough to support you for the rest of the year. So you need an actual job, which is probably nicer and pays enough that you don't want the seasonal job anymore.