Until XII - early XIII century. predominant type of economy in all the countries of South-East Asia (except for the area of Malacca Strait, where the state is the shopping Shrividzhayya) was subsistence farming.
The fight for the destruction of the old type and the creation of a new type, as is always the case in the Middle Ages, was conducted under religious slogans. So, on the surface of events, we see the struggle against the Hinayana Buddhism
However, in the XII-XIII centuries. this picture is changing thanks to the important events in world history. As a result of the Crusades Europe got a foothold in the Middle East and actively engaged in the Eastern trade. European demand for spices in XII century. dramatically revived the trade all the way from the shores of the Mediterranean to the South-East Asia. Mongol conquest, again unite fragmented China under one rule, created a vast new market for the goods in South-East Asia and Western products that are re-exported to Southeast Asia to China. South-East Asia, in turn, in exchange for their goods began to get more goods from the Far East, South and West Asia.
Increased demand for commodities led to the creation of new regional shopping centers in addition Shrividzhayi that in the XII century. declined as a result of failed foreign wars. The development of commodity relations caused by local feudal lords, as is always the case, increased thirst surplus and caused increased exploitation of the working masses.
At the same time, the social structure of the vast majority of the countries of South-East Asia during this period has been adapted to the natural economy. A significant part of the surplus product, which could consume lords, went to religious needs. The gigantic temple construction absorbed immense. The content of the numerous, powerful clergy also very dearly the people. The addition of these new burdens load should cause an explosion of popular anger, which boldly states of the old type.
This bitter struggle that unfolded in the XIII century. and continued in countries since the XIV century., on the side of the peasants were as young barbarian peoples (Thai, Shan, Lao), who invaded the region from the north, and part of the small local feudal lords, who recognized the need to destroy excessively swollen bureaucracy and privilege the clergy, as the only way out of the crisis.