The written sources do not offer deep insight on the economy of the kingdom; it counted mainly on agriculture during the Middle Bronze Age but, by the Late Bronze Age, it became based on trade with surrounding regions. Securing raw materials scarce near the city was an important concern for the rulers; basalt was an important building tool and it was probably acquired from the Salamiyah region or Al-Rastan. Calcite was provided from either the Syrian coast or Egypt, amber came from the Baltic region, while regions in modern Afghanistan provided carnelian and lapis-lazul.