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Monetary assets/liabilities are those whose value is known ex-ante (you can also think of them as more “liquid” assets if that helps). That includes anything held at “fair value”, cash, payables, receivables, and all debt (ST and LT). Conversely, we don’t quite know what we can sell our land, inventory, and intangibles for – so they are non-monetary.
Operating assets are not defined as well in the curriculum I believe, but they are by definition assets not related to the core business operations.