ci: Capital Investment
Variable
Global
Capital Investment []
ci = ci + dt *( cig - cid )

ci in the updating graph: ( how to read )
In nodes
cig : capital-investment generation
cii : capital-investment initial (capital units)
dt :
ci : capital investment
cid : capital-investment discard
Out nodes
cir : capital-investment ratio
ci : capital investment
cid : capital-investment discard