diff --git a/src/core/marketplace.h b/src/core/marketplace.h
index 5fc8ae2..41be492 100644
--- a/src/core/marketplace.h
+++ b/src/core/marketplace.h
@@ -56,9 +56,9 @@ class Marketplace
     friend class ExcelReader;
 
   private:
-    SellersVec sellers_;
-    SalesVec sales_;
-    BasketVec basket_;
+    SellersVec sellers_{500};
+    SalesVec sales_{50000};
+    BasketVec basket_{50};
 };
 
 double marketFee(int sumInCent, int percent, int maxFeeInCent);