Only five large rubber estates were established during his reign. Oil reserves were discovered in his final years. From the 1930s, through the work of the Chinese businesses in the kingdom, it became a significant raw material supplier, with Singapore as a major trading partner.
Over his reign, only five major rubber estates were created.  Oil was found during his final years. By the 1930s, Chinese companies in the country had established it as a major source of raw materials, with Singapore serving as a crucial trade partner.