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How may we quantify the value of physical resources, such as entangled quantum states, heat baths or lasers? Existing resource theories give us partial answers; however, these rely on idealizations, like perfectly independent copies of states or exact knowledge of a quantum state. Here we introduce the general tool of "currencies" to quantify realistic descriptions of resources, applicable in experimental settings when we do not have perfect control over a physical system, when only thedoi:10.3390/e23060755 pmid:34204010 pmcid:PMC8233888 fatcat:ve4gd4z2k5fvlbcgvfioewc4t4