Answer:
A new policy introduced.
Explanation:
Since you are working for the forestry service the one best way to enhance supply would be to introduce a new policy to enforce planting of trees, at the same time reducing the amount of trees to be cut down by local logging companies, by making it illegal to do so.
Next, as the new policy is implemented, the demand for trees would reduce with an increasing demand for forestry services to provide helpful guide on growing new trees.
A steady, sustainable profit lasting is guaranteed since more trees planted means more trainings, which means more services rendered and more service fees charged.
