diff --git a/isometric-park-fna/Engines/SimulationBridgeEngine.cs b/isometric-park-fna/Engines/SimulationBridgeEngine.cs
--- a/isometric-park-fna/Engines/SimulationBridgeEngine.cs
+++ b/isometric-park-fna/Engines/SimulationBridgeEngine.cs
@@ -103,26 +103,33 @@
                 }
             }
 
+
             #region calculate_entry
 
 
+            int new_visitor_count = 0;
             foreach (ref readonly var entity in ReadEntities<EntryPolicyComponent>())
             {
                 var entry_policy_component = GetComponent<EntryPolicyComponent>(entity);
 
                 if (entry_policy_component.PrimaryEntryPolicy == EntryPolicy.EntryFee)
                 {
-                    new_entry_fees = (decimal)(this.simulation.visitor_count * entry_policy_component.PrimaryEntryFee);
+                    //
+                    new_visitor_count = max(0, (int)((this.simulation.map.tree_count / 11) * ((10.00M  -entry_policy_component.PrimaryEntryFee)  / 10.00M)));
+                    new_entry_fees = (decimal)(new_visitor_count * entry_policy_component.PrimaryEntryFee);
                 }
                 else if (entry_policy_component.PrimaryEntryPolicy == EntryPolicy.Free)
                 {
+                    new_visitor_count = (this.simulation.map.tree_count / 11);
                     new_entry_fees = 0M;
                 }
                 else {
-                    new_entry_fees = (decimal)(this.simulation.visitor_count * 0.1 * 2.00);
+                    new_visitor_count = (this.simulation.map.tree_count / 11);
+                    var donor_count = max(0, (int)(new_visitor_count * ((10.00M  -entry_policy_component.PrimaryEntryFee)  / 10.00M)));
+                    new_entry_fees = (decimal)(donor_count * entry_policy_component.PrimaryEntryFee);
                     Logging.Spy(new {visitor_count = this.simulation.visitor_count, new_entry_fees = new_entry_fees});
                 }
-
+                this.simulation.visitor_count = new_visitor_count;
                 // new_entry_fees = 
             }
 
diff --git a/isometric-park-fna/Simulation.cs b/isometric-park-fna/Simulation.cs
--- a/isometric-park-fna/Simulation.cs
+++ b/isometric-park-fna/Simulation.cs
@@ -359,7 +359,7 @@
                 }
             }
 
-            this.visitor_count = this.map.tree_count / 10;
+            // this.visitor_count = this.map.tree_count / 10;
 
             Budget newBudget = new Budget
             {