In a textbook SAFe implementation, Lean Portfolio Management allocated a budget to each Value Stream and consequently each Agile Release Train (ART). The ART’s Product Manager works with the ART’s stakeholders to priorities the work that consumes that budget. The ART plans and executes against these priorities and no one worries about how much it costs to deliver any specific feature (or epic). However, there is often a difference between the ideal SAFe implementation and your current reality and one of those differences can be an expectation that the ART can articulate the cost of delivering a given feature (or epic). This is especially likely to be true if your ART is inside an organisation that still uses project based funding.