Karl Albrecht in Germany, and the fourth-richest in Europe. Karl Albrecht Karl Hans Albrecht (; 20 February 1920 – 16 July 2014) was a German entrepreneur who founded the discount supermarket chain Aldi with his brother Theo. He was for many years the richest person in Germany. In February 2014, he was ranked the 21st-richest person in the world by Hurun Report. Karl and Theo Albrecht were born and raised in a Catholic family in modest circumstances in Essen, Germany. Their father, Karl Sr, was employed as a miner and later as a baker's assistant. Their mother Anna, née Siepmann, had a
Perekrestok (supermarket chain) connected. In November 2017, X5 introduced machine learning to bolster targeted marketing at the Perekrestok supermarket chain, and developed personalised offers for all members of the Perekrestok Club loyalty program. The company leverages machine learning to group customers into segments based on common features and create offers for them. The system analyses groups of customers and designs personalised marketing campaigns based on demographic and several hundred behavioural factors, such as: frequency of purchases and ticket size, customer preferences, lifestyle fundamentals, acceptable price levels, favourite product categories and preferred shopping hours. Customer sensitivity to offers is predicted using various analytical models.