diff --git a/piecrust/src/session.rs b/piecrust/src/session.rs
index 1f56aeb2..e238b409 100644
--- a/piecrust/src/session.rs
+++ b/piecrust/src/session.rs
@@ -383,7 +383,7 @@ impl Session {
             return Err(InitalizationError("init call not allowed".into()));
         }
 
-        let (data, gas_spent, call_tree) =
+        let (data, gas_spent, call_tree, economic_mode) =
             self.call_inner(contract, fn_name, fn_arg.into(), gas_limit)?;
         let events = mem::take(&mut self.inner.events);
 
@@ -393,6 +393,7 @@ impl Session {
             events,
             call_tree,
             data,
+            economic_mode,
         })
     }
 
@@ -750,7 +751,7 @@ impl Session {
         fname: &str,
         fdata: Vec<u8>,
         limit: u64,
-    ) -> Result<(Vec<u8>, u64, CallTree), Error> {
+    ) -> Result<(Vec<u8>, u64, CallTree, EconomicMode), Error> {
         let stack_element = self.push_callstack(contract, limit)?;
         let instance = self
             .instance(&stack_element.contract_id)
@@ -782,20 +783,8 @@ impl Session {
         let ret = instance.read_bytes_from_arg_buffer(ret_len as u32);
         let economic_mode = instance.read_eco_mode();
 
-        let mut spent = limit - instance.get_remaining_gas();
+        let spent = limit - instance.get_remaining_gas();
 
-        match economic_mode {
-            EconomicMode::Allowance(allowance) if allowance > 0 => {
-                // the call has been paid for by the contract so we can set
-                // the spent amount to zero,
-                spent = 0;
-            }
-            EconomicMode::Charge(charge) => {
-                // add possible contract's charge
-                spent += charge;
-            }
-            _ => (),
-        }
         for elem in self.inner.call_tree.iter() {
             let instance = self
                 .instance(&elem.contract_id)
@@ -813,7 +802,7 @@ impl Session {
         mem::swap(&mut self.inner.call_tree, &mut call_tree);
         call_tree.update_spent(spent);
 
-        Ok((ret, spent, call_tree))
+        Ok((ret, spent, call_tree, economic_mode))
     }
 
     pub fn contract_metadata(
@@ -843,6 +832,9 @@ pub struct CallReceipt<T> {
 
     /// The data returned by the called contract.
     pub data: T,
+
+    /// Economic mode applied during the execution of the call.
+    pub economic_mode: EconomicMode,
 }
 
 impl CallReceipt<Vec<u8>> {
@@ -863,6 +855,7 @@ impl CallReceipt<Vec<u8>> {
             events: self.events,
             call_tree: self.call_tree,
             data,
+            economic_mode: self.economic_mode,
         })
     }
 }