Where does “pienkaupunki” come from?

pienkaupunki (Finnish) comes from Finnish kaupunki, from Old Gutnish kaupungr, from Old Norse kaupangr, from Old Norse kaup, from Old Norse kaupa, from Proto-Germanic kaupōną, from Proto-Germanic kaupô, from Latin caupo.

pienkaupunki (Finnish): (small) town a settlement larger than a village but smaller than a large city