Currency - Imperial Currency: The economic systems in existence across Imperial space vary from world to world and their levels of technological progression and so there is no standardised financial system or currency in use across the entire Imperium. On more primitive Feral and Feudal Worlds, there may be no system more complex than bartering or the exchange of a basic, precious metal-based currency.However, most civilised worlds that have achieved the standard level of Imperial starfaring technology make use of some form of fiat currency for all economic transactions which is often digital or electronic in form. The names of these currencies vary as wildly as the Human cultures that employ them. Some are used only on individual planets or their surrounding sub-sectors, while on others the currency may be accepted on a sector-wide or even multi-sector basis.For example, the Imperial currency of the Calixis Sector and many of the surrounding regions such as the Koronus Expanse is known as the "Throne Gelt," embodied in the form of metallic coins known simply as "thrones," a reference to the Emperor's Golden Throne. Currency of a similar name had been used as far back as the time of the Horus Heresy in some regions of the Imperium. This currency, like most in the Imperium used across several worlds, is a fiat currency based ultimately on the in-kind value of the local region's Imperial Tithes. There are also precious shell tokens or coins of rare or strategic metals that are accepted as legal tender on all of the civilised Imperial worlds of that sector. Thrones can also be dispersed in electronic form as payment, usually by using a data-slate.Human reavers and pirates across the frontiers of Imperial space are often refugees or descendants of settlers from the Imperium, and so understand Throne Gelt's value. Of course, to these Renegades, offering currency in trade without a display of force or at least a little bloodletting first is a sign of weakness. Yet some Renegades, dark corsairs and slavers among them, favour hacksilver, items of technology, ammunition, and slaves as currency -- or trapped souls and bottled vitality, if the darkest stories are to be believed.In the time of the Great Crusade and the Horus Heresy, the most common form of Imperial currency were coins known as "Aquila pieces." They came in various denominations, including a five Aquila piece, which was about the same size as the coins used at present to represent thrones. Aquila pieces were commonly used among the expeditionary fleets of the Great Crusade and were introduced into the worlds they brought to Imperial Compliance for use in interstellar trade.A currency known as "crowns" were also used at the time of the Great Crusade and were still in use in the 41st Millennium on the Mining World of Karoscura.On the Hive World of Necromunda, the standard planetary currency is known as the "credit."The "ducat" is a unit of currency issued by the Navigator houses of the Navis Nobilite in the 41st Millennium that comes in the form of golden coins. They are usable as currency wherever the vessels of the Navis Nobilite go in the galaxy, particularly when carrying out transactions between the houses themselves.The "Estrillian newmark" was a planetary currency in use on the world of Atraxia in the 41st Millennium. On Atraxia, a tarot deck could cost approximately 27 newmarks.