===================================================================
--- original.js
+++ change.js
@@ -59,8 +59,36 @@
 			self.phones.splice(index, 1);
 		}
 	};
 });
+// Shop class representing the shop entity
+var Shop = Container.expand(function () {
+	var self = Container.call(this);
+	self.buyPhone = function (player) {
+		if (player.money >= 100) {
+			var newPhone = new Phone();
+			newPhone.x = Math.random() * 2048;
+			newPhone.y = Math.random() * 2732;
+			player.phones.push(newPhone);
+			game.addChild(newPhone);
+			player.money -= 100;
+		}
+	};
+	self.upgradePhone = function (player, phone) {
+		if (player.money >= 50) {
+			phone.upgrade();
+			player.money -= 50;
+		}
+	};
+	self.sellPhone = function (player, phone) {
+		var sellPrice = phone.sell();
+		player.money += sellPrice;
+		var index = player.phones.indexOf(phone);
+		if (index > -1) {
+			player.phones.splice(index, 1);
+		}
+	};
+});
 
 /**** 
 * Initialize Game
 ****/ 
@@ -73,8 +101,10 @@
 ****/ 
 // Initialize player
 var player = new Player();
 game.addChild(player);
+// Initialize shop
+var shop = new Shop();
 // Display player's money
 var moneyTxt = new Text2('Money: $' + player.money, {
 	size: 50,
 	fill: "#ffffff"
@@ -103,13 +133,13 @@
 	}
 	if (touchedPhone) {
 		// Upgrade or sell the touched phone
 		if (obj.event.shiftKey) {
-			player.sellPhone(touchedPhone);
+			shop.sellPhone(player, touchedPhone);
 		} else {
-			player.upgradePhone(touchedPhone);
+			shop.upgradePhone(player, touchedPhone);
 		}
 	} else {
 		// Buy a new phone if no phone was touched
-		player.buyPhone();
+		shop.buyPhone(player);
 	}
 };
\ No newline at end of file