At the bare minimum, a Revenue or Operating Income or Net Income number has to be associated with a time period during which those numbers were reported. Ideally, they'd indicate whether they're GAAP (or the international equivalent), audited, pro-forma, etc. But it's critical that they be associated with a time period, otherwise they're meaningless.
Financial metrics should be tied to a time period
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I agree. Moreover, not only does making fields such as incomes and revenues a Dated Currency (a type that does not currently exist) make such numbers meaningful, but it makes possible queries that compute period-to-period growth in those figures. So someone could query all companies with large growth in profit (though profit isn't yet a property of a company!) over the last two years.
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There actually is a date property on the monetary value for these properties, but unfortunately, you have to view the topic page for the value itself to add it. I.e., if you mouse-over the value in the property list, click the little arrow that appears, and select "view" from the menu. But this is less than ideal. I'll open a bug to change the expected type to one where the date is more easily visible. (This will require data migration, so it may take some time to implement this.)
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