You can rephrase that as inflation benefits borrowers more that savers. And borrowers benefit lenders. In the opposite paradigm, savers benefit savers and savers benefit investors. Think of a scenarios that is made up of an economy of a single currency, that is deflationary and everybody saves as much as they can, but they have to eat, so trade still occurs. Those that can save more accumulate more purchasing power until they think it wise to invest and get a greater return. Assuming all perfect investment execution, wealth would tend to aggregate as we see, but overall everybody benefits and see the rising tide lift all boats.