Main point
Srimad-Bhagavatam
SB Canto 4
The word upagupta-vittaḥ is very significant in this verse. It indicates that no one would know the extent of the riches King Pṛthu would confidentially keep. The idea is that not only the king but everyone should keep his hard-earned money confidentially and secretly so that in due course of time the money can be spent for good, practical purposes. In Kali-yuga, however, the king or government has no well-protected treasury, and the only means of circulation is currency notes made of paper. Thus in times of distress the government artificially inflates the currency by simply printing papers, and this artificially raises the price of commodities, and the general condition of the citizens becomes very precarious. Thus keeping one's money very secretly is an old practice, for we find this practice present even during the reign of Mahārāja Pṛthu. Just as the king has the right to keep his treasury confidential and secret, the people should also keep their individual earnings a secret. There is no fault in such dealings. The main point is that everyone should be trained in the system of varṇāśrama-dharma so that the money is spent only for good causes and nothing else.