SUGGESTION
This research suggests further study as follows.
1. This model has limitations due to factors that affect the
volatility of the price of palm oil and seasonal factors which
are the external factors that affect rubber prices. The rubber
prices have not been analysed because of the limitations of the
data therefore, the values obtained from experiments may be
incorrect.
2. Factors and variables in this research are just some of
the factors that affect the price of natural rubber in Thailand.
To give a more complete model factors may be added that are
more correlated. This makes it possible to create more policies
that are associated with the price of rubber.