diff --git a/src/main/java/temppackage/Purchase.java b/src/main/java/temppackage/Purchase.java
index b929f27..0db1f8e 100644
--- a/src/main/java/temppackage/Purchase.java
+++ b/src/main/java/temppackage/Purchase.java
@@ -1,12 +1,25 @@
 package temppackage;
 
+import temppackage.calculators.PurchaseCalculator;
+
 public class Purchase extends Transaction {
 
-  public Purchase(Share share, int week) {}
+  public Purchase(Share share, int week) {
+    super(share, week, new PurchaseCalculator(share));
+  }
 
   @Override
   public void commit(Player player) {
-    // TODO Auto-generated method stub
-    super.commit(player);
+    if (isCommitted()) {
+      throw new IllegalStateException("Already committed");
+    }
+
+    if (player.getMoney().compareTo(getCalculator().calculateTotal()) < 0) {
+      throw new IllegalStateException("Not enought money");
+    }
+    player.withdrawMoney(getCalculator().calculateTotal());
+    player.getPortfolio().addShare(getShare());
+    player.getTransactionArchive().add(this);
+    setCommitted(true);
   }
 }