I'm not terribly familiar with the details of this, other than a general sense that the Baltic countries (like much of eastern Europe) were deeply divided between industrialized urban cores (which had previously had German speaking populations) and much less well industrialized rural areas.

However, an instant's googling turned up this paper: http://www.academia.edu/1197692/Standard_of_Living_in_Estonia_and_Finland_in_the_1930s

which seems like it's directly aimed at your question.