Calculate prices at the appropriate level

src/simulation/optimisation.rs

@@ -263,14 +263,6 @@ impl Solution<'_> {
             .map(|((asset, time_slice), &value)| (asset, time_slice, Activity(value)))
     }
 
-    /// Iterate over the keys for activity for each existing asset
-    pub fn iter_activity_keys_for_existing(
-        &self,
-    ) -> impl Iterator<Item = (&AssetRef, &TimeSliceID)> {
-        self.iter_activity_for_existing()
-            .map(|(asset, time_slice, _activity)| (asset, time_slice))
-    }
-
     /// Activity for each candidate asset
     pub fn iter_activity_for_candidates(
         &self,