The average personal amount of savings are between $ 2,900 for the USA and ¥ 5,806,554 for Japan. The USA comes last in our ranking, but their neighbor Canada is one of the richest countries regarding personal savings.
I don't think that this metric is bad for the US citizens. We need to know where those money go to. Do they shop or do they invest them? If the latter happens, then this is a crucial factor which provides growth to their income.