Theo Albrecht, who helped built Aldi in Germany died today age 88.

The brothers stuck to that business model as they steadily expanded throughout Germany and eventually Europe and overseas markets, including the United States. Both became billionaires; Theo ranked 31st on Forbes magazine’s most recent list of the world’s richest people, with $16.7 billion. Karl, who survives his brother, was 10th with $23.5 billion.