diff --git a/src/main/java/com/Acrobot/ChestShop/Configuration/Properties.java b/src/main/java/com/Acrobot/ChestShop/Configuration/Properties.java
index d5c8126..b1a83d0 100644
--- a/src/main/java/com/Acrobot/ChestShop/Configuration/Properties.java
+++ b/src/main/java/com/Acrobot/ChestShop/Configuration/Properties.java
@@ -130,6 +130,9 @@ public class Properties {
     @ConfigurationComment("If true, people will be able to buy/sell in 64 stacks while holding the crouch button.")
     public static boolean SHIFT_SELLS_IN_STACKS = false;
 
+    @ConfigurationComment("If true, people will be able to sell/buy everything available of the same type.")
+    public static boolean SHIFT_SELLS_EVERYTHING = false;
+
     @ConfigurationComment("What can you do by clicking shift with SHIFT_SELLS_IN_STACKS turned on? (ALL/BUY/SELL)")
     public static String SHIFT_ALLOWS = "ALL";
 
diff --git a/src/main/java/com/Acrobot/ChestShop/Listeners/Player/PlayerInteract.java b/src/main/java/com/Acrobot/ChestShop/Listeners/Player/PlayerInteract.java
index 39c267f..159dadc 100644
--- a/src/main/java/com/Acrobot/ChestShop/Listeners/Player/PlayerInteract.java
+++ b/src/main/java/com/Acrobot/ChestShop/Listeners/Player/PlayerInteract.java
@@ -203,6 +203,20 @@ public class PlayerInteract implements Listener {
                 price = price.divide(BigDecimal.valueOf(amount), MathContext.DECIMAL128).multiply(BigDecimal.valueOf(newAmount)).setScale(Properties.PRICE_PRECISION, BigDecimal.ROUND_HALF_UP);
                 amount = newAmount;
             }
+        } else if (Properties.SHIFT_SELLS_EVERYTHING && player.isSneaking() && !price.equals(PriceUtil.NO_PRICE) && isAllowedForShift(action == buy)) {
+            if (action != buy) {
+                int newAmount = InventoryUtil.getAmount(item, player.getInventory());
+                if (newAmount > 0) {
+                    price = price.divide(BigDecimal.valueOf(amount), MathContext.DECIMAL128).multiply(BigDecimal.valueOf(newAmount)).setScale(Properties.PRICE_PRECISION, BigDecimal.ROUND_HALF_UP);
+                    amount = newAmount;
+                }
+            } else if (!adminShop && ownerInventory != null) {
+                int newAmount = InventoryUtil.getAmount(item, ownerInventory);
+                if (newAmount > 0) {
+                    price = price.divide(BigDecimal.valueOf(amount), MathContext.DECIMAL128).multiply(BigDecimal.valueOf(newAmount)).setScale(Properties.PRICE_PRECISION, BigDecimal.ROUND_HALF_UP);
+                    amount = newAmount;
+                }
+            }
         }
 
         item.setAmount(amount);