One thing I've been thinking about: the Federation is a collection of other societies that share certain values (freedom, equality, equity, egalitarianism, whatever). They largely run their own planets, have their own governments, and the UFP acts as a kind of more centralized version of the United Nations. The UFP central government handles trade and security, and sets rules and regulations that members have to abide by, but members largely govern themselves. That's why members of the Federation Council are ambassadors. As long as members follow the Federation Constitution, everything if fine and they can govern themselves as they see fit.
Under these circumstances, it makes sense that their would be some kind of basic currency for certain items depending on the planet. I can also see circumstances where dealing with non-Federation entities (governments, independent colonies, etc.) would require being part of an interstellar monetary system, hence gold-pressed latinum. The Federation doesn't use money, but individual members may to a limited extent, and there is some kind of interstellar exchange. That kind of solves the issue.
Under these circumstances, it makes sense that their would be some kind of basic currency for certain items depending on the planet. I can also see circumstances where dealing with non-Federation entities (governments, independent colonies, etc.) would require being part of an interstellar monetary system, hence gold-pressed latinum. The Federation doesn't use money, but individual members may to a limited extent, and there is some kind of interstellar exchange. That kind of solves the issue.
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