Nomenclature
Y Yield or production
C Consumptions
I Investments
IU not programmed Investment in supplyes
S Saving
G Spold for goods and services
TA Taxes
TR Transfers
NX clean Exports
YD Disposable income
L real Question of currency
DB Question of obligations in real terms
the Interest rate
b Sensibility of the investment to the interest rate
k Sensibility of the question of currency to the yield
h Sensibility of the question of currency to the interest rate
W Wealth financial institution reale W = L DB
WN Wealth financial
institution nominale 
P Level of the prices
H nominal Stock of currency
SB real Value of the offer of obligations
R real Exchange rate
e nominal Exchange rate
P Level of the inner prices
Pf Level of the foreign prices
fthe international Interest rate