--- old_apply_guidance.js
+++ new_apply_guidance.js
@@ -1,5 +1,6 @@
 function apply_guidance(doc: any) {
   let mostRelevantMarketPrice = null;
   let mostRelevantMarketKey = null;
+  let earliestCustomerPriceSince2020 = null;
   let highestMarketRelevanceLevel = -1;
 
   let mostRelevantCustomerPrice = null;
@@ -20,6 +21,15 @@
       let customerRelevance = 0; // Assume 0 is 'not relevant'
 
       // ... (rest of the existing logic)
+
+      // Check for the earliest customer price since 2020
+      if (item.cust && item.last_season >= 2020) {
+        if (earliestCustomerPriceSince2020 === null || item.last_season < earliestCustomerPriceSince2020.season) {
+          earliestCustomerPriceSince2020 = {
+            price: item.last_price,
+            season: item.last_season
+          };
+        }
+      }
 
       // ... (rest of the existing logic)
 
@@ -50,6 +60,10 @@
   // ... (rest of the existing logic)
 
   // Assign the most relevant customer price and key to the top level of the document
+  if (earliestCustomerPriceSince2020 !== null) {
+    doc.earliestCustomerPriceSince2020 = earliestCustomerPriceSince2020;
+  }
+
   if (mostRelevantCustomerPrice !== null) {
     doc.mostRelevantCustomerPriceInfo = {
       price: mostRelevantCustomerPrice,