diff --git a/src/core/seller.cpp b/src/core/seller.cpp
index e4de084..be247db 100644
--- a/src/core/seller.cpp
+++ b/src/core/seller.cpp
@@ -1,26 +1,23 @@
 #include "seller.h"
 
-void Seller::setSellerNo(int seller_no)
-{
-    sellerNo_ = seller_no;
-}
+Seller::Seller() : Entity() {}
 
-void Seller::setFirstName(const std::string& firstName)
+Seller::Seller(const std::string& firstName, const std::string& lastName, int sellerNo,
+               int numberOfArticles)
+    : Entity()
 {
     firstName_ = firstName;
-}
-
-void Seller::setLastName(const std::string& lastName)
-{
     lastName_ = lastName;
+    sellerNo_ = sellerNo;
+    numberOfOfferedArticles_ = numberOfArticles;
 }
 
-void Seller::setNumberOfOfferedArticles(int number)
-{
-    numberOfOfferedArticles_ = number;
-}
+inline void Seller::setSellerNo(int seller_no) { sellerNo_ = seller_no; }
 
-size_t Seller::getNumberOfOfferedArticles()
-{
-    return articles_.size();
-}
\ No newline at end of file
+inline void Seller::setFirstName(const std::string& firstName) { firstName_ = firstName; }
+
+inline void Seller::setLastName(const std::string& lastName) { lastName_ = lastName; }
+
+inline void Seller::setNumberOfOfferedArticles(int number) { numberOfOfferedArticles_ = number; }
+
+inline size_t Seller::getNumberOfOfferedArticles() { return articles_.size(); }
\ No newline at end of file
diff --git a/src/core/seller.h b/src/core/seller.h
index 2848579..d5dfc18 100644
--- a/src/core/seller.h
+++ b/src/core/seller.h
@@ -1,8 +1,8 @@
 #ifndef SELLER_H
 #define SELLER_H
 
-#include "entity.h"
 #include "article.h"
+#include "entity.h"
 
 #include <string>
 #include <vector>
@@ -12,6 +12,9 @@ class Article;
 class Seller : public Entity
 {
   public:
+    Seller();
+    Seller(const std::string& firstName, const std::string& lastName, int sellerNo = 0,
+           int numberOfArticles = 0);
     void setSellerNo(int sellerNo);
     void setFirstName(const std::string& firstName);
     void setLastName(const std::string& lastName);