diff --git a/handler.bas b/handler.bas
index df3e991..d3cfd4f 100644
--- a/handler.bas
+++ b/handler.bas
@@ -366,7 +366,14 @@ Sub month_tosheet(ByRef pkg() As Variant)
             
             '--base--
             If co_num(pkg(i, 2), 0) = 0 Then
-                sh.Cells(i + 1, 7) = 0
+                'if there is no monthly base volume,
+                'then use the prior price, if there was no prior price,
+                'then inherit the average price for the year before current adjustments
+                If sh.Cells(i, 7) <> 0 Then
+                    sh.Cells(i + 1, 7) = sh.Cells(i, 7)
+                Else
+                    sh.Cells(i + 1, 7) = (pkg(13, 5) + pkg(13, 6)) / (pkg(13, 1) + pkg(13, 2))
+                End If
             Else
                 sh.Cells(i + 1, 7) = pkg(i, 6) / pkg(i, 2)
             End If
@@ -383,7 +390,14 @@ Sub month_tosheet(ByRef pkg() As Variant)
             
             '--forecast--
             If co_num(pkg(i, 4), 0) = 0 Then
-                sh.Cells(i + 1, 10) = 0
+                'if there is no monthly base volume,
+                'then use the prior price, if there was no prior price,
+                'then inherit the average price for the year before current adjustments
+                If sh.Cells(i, 10) <> 0 Then
+                    sh.Cells(i + 1, 10) = sh.Cells(i, 10)
+                Else
+                     sh.Cells(i + 1, 10) = (pkg(13, 5) + pkg(13, 6)) / (pkg(13, 1) + pkg(13, 2))
+                End If
             Else
                 sh.Cells(i + 1, 10) = pkg(i, 8) / pkg(i, 4)
             End If