The phenomenon exists in multiple countries , and can become a social or political issue , for example in the 2016 Indian banknote demonetisation . In some societies , this surreptitious custom is attached to a particular term , idiom , or other cultural expression : In Japan , it is referred to as '' hesokuri '' ( " navel hoarding " ) , or in the past it was '' haribako-gin '' ( " sewing box silver " ) ; in Germany , it is referred to as '' schwarze Kasse '' ( " black coffer " ) ; and in Eastern European Jewish communities , it is called the '' knipl '' ( " knot " , as in a knotted kerchief )
2016 Indian banknote demonetisation
2016 Indian banknote demonetisation
Housewife hidden savings