Later in 1920 and 1921, "Shanghai Securities & Commodities Exchange" and "Shanghai Chinese Merchant Exchange" started operation respectively. An amalgamation eventually took place in 1929, and the combined markets operated thereafter as the "Shanghai Stock Exchange". Shipping, insurance, and docks persisted to 1940 but were overshadowed by industrial shares after the Treaty of Shimonoseki of 1895, which permitted Japan, and by extension other nations which had treaties with China, to establish factories in Shanghai and other treaty ports. Rubber plantations became the staple of stock trading beginning in the second decade of the 20th century.