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Currency allows the building of marketplaces which increase tax and luxury revenue.
| Prerequisite advances:|
| Currency (Civ1)|
| Needed for further advances:|
As cities grew, their internal economies became more complicated. People specialized in their labors, some producing grain, some pottery, some bricks, etc. A system of barter developed so that the wares and services of one individual could be exchanged for those of another. In response to the need for a medium of exchange, and for more sophisticated ways to store purchasing power and set standards of value, Currency came into use. The first satisfactory Currency was coinage made from electrum, a naturally occurring alloy of gold and silver.