By the arrangement of the Supreme Personality of Godhead, the rivers on some planets produce gold on their banks. The poor inhabitants of this earth, because of their incomplete knowledge, are captivated by a so-called bhagavan who can produce a small quantity of gold. However, it is understood that in a higher planetary system in this material world, the mud on the banks of the Jambu-nadi mixes with jambu juice, reacts with the sunshine in the air, and automatically produces huge quantities of gold. Thus the men and women are decorated there by various golden ornaments, and they look very nice. Unfortunately, on earth there is such a scarcity of gold that the governments of the world try to keep it in reserve and issue paper currency. Because that currency is not backed up by gold, the paper they distribute as money is worthless, but nevertheless the people on earth are very proud of material advancement. In modern times, girls and ladies have ornaments made of plastic instead of gold, and plastic utensils are used instead of golden ones, yet people are very proud of their material wealth. Therefore the people of this age are described as mandah sumanda-matayo manda-bhagya hy upadrutah (Bhag. 1.1.10). In other words, they are extremely bad and slow to understand the opulence of the Supreme Personality of Godhead. They have been described as sumanda-matayah because their conceptions are so crippled that they accept a bluffer who produces a little gold to be God. Because they have no gold in their possession, they are actually poverty stricken, and therefore they are considered unfortunate.
Source: A.C. Bhaktivedanta Swami Prabhupada (2014 edition), “Srimad Bhagavatam”, Fifth Canto, Chapter 16 – Text 20-21