Cropped timbers require low amount of maintenance and operation cost, but the farmers can be an important source of income to compensate the lower margin when rubber price is low and wage for farm labor is high.
Other main sources of income are intercropped fruit trees and other kinds of plants.
The level of flexibility depends on various factors: quantities and kinds of intercropped timber, appropriate cutting period of timber, efficiency in plot management by farmers to increase yields of intercropped fruit trees, and adaptation of other kinds of products in the plots to increase household income.