vähentymisellä
vähentymisellä is a Finnish word that translates to "by reduction," "through diminution," or "with decrease" in English. It is the adessive case of the abstract noun vähentyminen, which means reduction or decrease. The adessive case in Finnish typically indicates a location, a means, or an accompaniment. In the context of vähentymisellä, it most commonly signifies the manner or method by which something is achieved or occurs, specifically through a process of lessening or making smaller.
For instance, one might say "hinta nousi inflaatiolla, mutta ostovoima pysyi samana vähentymisellä" which roughly translates