“In the first two books: “The Medieval Empire of the Jews” and “The Collapse of the Empire of the Jews,” which are called historical investigations, together with historians, readers and lovers of unraveling world mysteries, we tried to consider one completely mysterious question. If in the past there had been a single worldwide Empire, as modern researchers of history tell us, then who would have carried out economic functions within its borders? It must be remembered that any public association, be it a city, a state or a federation of states, for example, an empire, is obliged to have some kind of economic network that pulls his life together into a single whole. Any public structured association must have its own, figuratively speaking, golden web. In previous books, we called such an economic structure within society the circulatory system of the social organism, and the employees of this system as certain blood globules that carry oxygen to all its parts. The oxygen of the economic system is money or any other universal equivalent for the valuation of goods and services. If such a network existed in a hypothetical world Empire, then it should have had several functions...”