The system of weights and measures was somewhat idiosyncratic, though the inscriptions link it more or less to an Indian model. For example, the area of a paddy field was measured according to the number of casts of seed needed to sow it. Coinage did not exist, and the few coins found at Oc_Eo, apparently of foreign origin, do not indicate a currency in general use at this early period. Barter trade was the norm and is attested in numerous inscriptions. Larger transactions were paid for by the appropriate weight of gold or silver. Coins only made their appearance in the 16th century under thee influence of the Spaniards, who also named the unit of currency, the riel bing only a slight modification of the Spanish rial.
Transport was on foot or in a cart or palanquin, and perhaps most often, as in recent times, by boat along the many rivers during the wet season, or on the canals and the Great Lake. There does not seem to have been an organised network of canals linking the rivers, but there was a well-maintained system of main roads, lined with trees to provide shade, such as the road from Angkor to the site of Preah Khan at Kompong Svay (Known as the 'great' Preah Khan temple). The route visible nowadays, with its striking monumental bides, is probably not earlier than the thirteenth century. Other stretches of early roads have been identified. They were used for the great royal progresses of the cool season, when the king took advantage of the end of the monsoon to inspect his domains and where necessary to restore order.