"Beginning on November 20, 1923, 1,000,000,000,000 old Marks were exchanged for 1 Rentemark, this ended the hyperinflation and the German Mark was never in trou

"Beginning on November 20, 1923, 1,000,000,000,000 old Marks were exchanged for 1 Rentemark, this ended the hyperinflation and the German Mark was never in trouble again." The end, and we learn nothing about how this fixed the situation.