Abstract
There has been a noticeable trend in recent research towards the use of private archives in the study of the commercial behaviour of and relations between individual businesses. Previously only public records have tended to be used, and attention has been focused on one aspect of an economy as a whole, or of a region, or a single important town. Even if, for example, the names of importers or exporters have been entered in customs records, official sources cannot provide an answer to anything like all the important questions. Many business histories have been published which have not contributed very much because they have generally not advanced beyond the narrative level, leaving untapped the incomparable material contained in accounts and ledgers. A pre-requisite for the study of private business firms is, of course, that documentary series should have been preserved unbroken for a fairly long period. Farmers did not keep account books, and only through the accounts of the merchants with whom they traded may we examine their businesses. Only a small proportion of merchants’ accounts in North Ostrobothnia from the eighteenth and nineteenth centuries have been preserved; but entries may by even a single merchant in respect of goods bought from or sold to farmers add up over several decades to such an enormous material that some form of sampling is called for limiting him to the classification employed in the official statistics.