Malé Island is the chief commercial center. Sri Lankan and Indian merchants in Malé act as their own importers, exporters, and wholesalers. The importing of rice and exporting of ambergris are government monopolies. Tourism and its related services are a major portion of the economy. Most shops are open from 8 AM to 1:30 PM and from 2:30 to 5 PM , Sunday through Thursday. Banks and government offices are open from 9 AM to 1 PM on the same days. Most establishments are closed on Fridays.