Lao social structures are comparatively simpler than in neighboring Cambodia or Thailand, which is a logical outgrowth considering the ethnic diversity of Laos. Lao Theung and Lao Sung groups were outside the traditional class structures, but together made up a large portion of the population.
Traditionally the king was at the apex of secular and religious authority, as both the head of the sangha and his saksit power in animist beliefs. The remainder of the population was headed by a class of nobility and then the general population. There were no strong caste rules as appeared in Thailand with sakdi na or Khmer based cultures. Apart from the social structure was the Theravada clergy, which were due respect regardless of class. The fact the most males became monks at some point in their lives provided a route for social mobility and exposure to formal education.
Bargaining/haggling
While bargaining is common in Laos - in the market or in negotiating a trip on a saamlor or tuk-tuk, for example - it is not heavy-duty haggling. The Lao are extremely laid back and it is rare to be fleeced; don't bargain hard with them, it may force them to lose face and reduce prices well below their profit margin. For most things, you won't even really need to bargain. Approach bargaining with a sense of fun; a smile or joke always helps.