I cannot write a concise summary right now, but can point you to these links of examples that should provide a pretty good understanding/concept of IoV.
https://wepower.network/ This line says it all. "It enables green energy producers to raise capital by issuing tradable energy tokens". Basically the value ("V") we're talking about here is in the energy tokens (similar to the value we place in Bitcoins and all other cryptocurrencies")
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