Hi there,
Thanks for sharing that example. The thing I am unclear about is that the subgood flow appear to be considered as a substance by the software, rather than a good? (with the mass fraction/concentration input boxes rather than volume and density). I am trying to build an MFA model for fruit and vegetables (all different commodities), in different regions of a country, considering imports and exports and the various stages of their life cycle. So I need to be able to work at different scales (national, regional) for many commodities. Is that something that can be done with STAN?