Credit
In the future beyond the Rift Wars, currency is a hard thing to nail down. The money that you have (termed credit) is the measure of your influence within an AI's sphere, or the sum total of relationships that you have with suppliers, peddlers, and people that owe you favours. Sometimes, these things can be converted into crypto currency, or be represented by a cache of artefacts, or the wreckage of an ancient striker that no one else knows about, but many times, it is too fluid to measure.
To represent this sum total of your influence, we use the term credit. The prices in the rulebooks are represented in credit as two numbers separated by a colon (“:”). The first number represents the complexity of the object and the second represents the rarity of the object. Therefore if you see an item with a cost of 80:1, then it's complexity is 80 and its rarity is 1 (common).
complexity:rarity(cost)
80:3(cost)
Under normal circumstances an item listed with a cost of 80:3, would require 3 x 80 = 240 credits to buy. But you can be under circumstances where these rare items are easily obtained, in which case, its only 80 credits to buy. There are also circumstances where items of such rarity are not available at all. A desert outpost, on a backward planet, at the “arse-end of space”, would probably not have anything over the rarity of 1.