rotation interval for the simulations was 50 years, since household
forest owners can use their forest lands for 50 years at most
(Government of Vietnam, 1999). Yet in Vietnam, there can also be
an opportunity for households to extend their ownership of forestry
land if the government has no prior plan to use the land. This
means that at plantation establishment, if the forest owners know
that their ownership could be extended (e.g., by 20 years); then the
planning horizon of the model will be longer (i.e., up to 70 years
instead of 50 years). In turn this means that the optimal rotation age
can possibly be longer. However, if forest owners can only confirm
such an extension at the end of their current contract (i.e., at the
50 year time point), then it is unlikely that the optimal rotation age
for the whole planning horizon will be longer.