diff --git a/src/main/java/millions/model/factories/PurchaseFactory.java b/src/main/java/millions/model/factories/PurchaseFactory.java
new file mode 100644
index 0000000..e2b52f7
--- /dev/null
+++ b/src/main/java/millions/model/factories/PurchaseFactory.java
@@ -0,0 +1,10 @@
+package millions.model.factories;
+
+import millions.model.Purchase;
+import millions.model.Share;
+
+public class PurchaseFactory extends TransactionFactory {
+  public Purchase createTransaction(Share share, int week) {
+    return new Purchase(share, week);
+  }
+}
diff --git a/src/main/java/millions/model/factories/SaleFactory.java b/src/main/java/millions/model/factories/SaleFactory.java
new file mode 100644
index 0000000..4da40ee
--- /dev/null
+++ b/src/main/java/millions/model/factories/SaleFactory.java
@@ -0,0 +1,10 @@
+package millions.model.factories;
+
+import millions.model.Sale;
+import millions.model.Share;
+
+public class SaleFactory extends TransactionFactory {
+  public Sale createTransaction(Share share, int week) {
+    return new Sale(share, week);
+  }
+}
diff --git a/src/main/java/millions/model/factories/TransactionFactory.java b/src/main/java/millions/model/factories/TransactionFactory.java
new file mode 100644
index 0000000..8c2eb5c
--- /dev/null
+++ b/src/main/java/millions/model/factories/TransactionFactory.java
@@ -0,0 +1,8 @@
+package millions.model.factories;
+
+import millions.model.Share;
+import millions.model.Transaction;
+
+public abstract class TransactionFactory {
+  public abstract Transaction createTransaction(Share share, int week);
+}