alai: Average Life Agricultural Inputs
Variable
Agricultural sector
Average Life Agricultural Inputs [year]
alai = clip ( alai1 , alai2 , pyear , time)

alai in the updating graph: ( how to read )
In nodes
alai1 : average life of agricultural inputs 1
alai2 : average life of agricultural inputs 2
pyear : POLICY YEAR
Out nodes
ai : Agricultural Inputs
mpai : marginal productivity of agricultural inputs