diff --git a/Business/Sales/MarketShareEstimation.php b/Business/Sales/MarketShareEstimation.php
new file mode 100644
index 000000000..e41c89b58
--- /dev/null
+++ b/Business/Sales/MarketShareEstimation.php
@@ -0,0 +1,49 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 7.1
+ *
+ * @category   TBD
+ * @package    TBD
+ * @author     OMS Development Team <dev@oms.com>
+ * @author     Dennis Eichhorn <d.eichhorn@oms.com>
+ * @copyright  Dennis Eichhorn
+ * @license    OMS License 1.0
+ * @version    1.0.0
+ * @link       http://orange-management.com
+ */
+declare(strict_types=1);
+namespace phpOMS\Business\Sales;
+/**
+ * Market share calculations
+ *
+ * @category   Framework
+ * @package    phpOMS\Business
+ * @author     OMS Development Team <dev@oms.com>
+ * @author     Dennis Eichhorn <d.eichhorn@oms.com>
+ * @license    OMS License 1.0
+ * @link       http://orange-management.com
+ * @since      1.0.0
+ */
+class MarketShareEstimation {
+    public static function getRankFromMarketShare(int $participants, float $marketShare, float $modifier = 1.0) : int
+    {
+        $sum = 0.0;
+        for($i = 0; $i < $participants; $i++) {
+            $sum += 1 / pow($i+1, $modifier);
+        }
+    
+        return (int) round(pow(1 / ($marketShare * $sum); 1 / $modifier));
+    }
+    
+    public static function getMarketShareFromRank(int $participants, int $rank, float $modifier = 1.0) : float
+    {
+        $sum = 0.0;
+        for($i = 0; $i < $participants; $i++) {
+            $sum += 1 / pow($i+1, $modifier);
+        }
+        
+        return (1 / pow($rank, $modifier)) / $sum;
+    }
+}