sc: Service Capital
Variable
Capital sector
Service Capital [$]
sc = sc + dt*( scir - scdr )

sc in the updating graph: ( how to read )
In nodes
sci : initial service capital
scir : service capital investment
sc : Service Capital
scdr : service capital depreciation
Out nodes
pjss : potential jobs service sector
so : service output
sc : Service Capital
scdr : service capital depreciation