GDP: gross domestic product;

GNP: gross national product;

NDP: net gross domestic product (NDP=GDP- depreciation);

NNP: net gross national product (NNP=GNP- depreciation);

NI: national income = y；;

PI: personal income;

DPI: disposable personal income;

C: (consumption) residents' consumption expenditure;

CRB: commodity futures price index;

ECI: employment cost index;

One: (investment) enterprise investment;

G: (government procurement) government procurement expenditure;

T: (tax) government tax;

TR: government transfer payment;

NX: net outlet (x-m; X: export, m: import);

GDP=C+I+G+(X-M)=C+I+G+NX (expenditure method);

N: employment;

U: unemployed;

L: total labor force (l = n+u);

U: unemployment rate (u = u/l);

N: employment rate (n = n/l);

CPI: Consumer price index;

PPI: producer price index;

C: consumption;

I: investment;

S: savings;

T: tax;

G: government procurement;

X: exit;

M: import;

Y: disposable income;

APC: average propensity to consume;

Marginal propensity to consume;

APS: average propensity to save;

MPS: marginal propensity to save;

MDT: transactional currency demand;

Ki: investment multiplier (+);

Kt: tax multiplier (-);

KB: balanced budget multiplier (KB = kg+KT =1);

Ktr: government transfer payment multiplier;

Kx: export multiplier;

Km: import multiplier;

K: share capital (Δ k = i);

R0: present value or principal;

Rn: the sum of future income or final principal and interest in the nth year;

R: annual interest rate;

rn = R0( 1+r)n；

Pk: the supply price of capital goods;

MEC: marginal efficiency of capital, which is a discount rate;

D: the response of investment demand to the change of interest rate;

E: spontaneous investment;

α: marginal propensity to save;

β: marginal propensity to consume;

I: investment;

S: savings;

Is it a curve? : the equilibrium of commodity market;

LM curve: money supply and demand are equal;

MS: nominal money supply;

V: the speed of money circulation;

L: money demand;

L 1: transaction demand and prevention demand of currency;

L2: Speculative demand for money;

L 1(y): transaction currency demand;

L2(y): the demand for speculative funds;

M: money supply (nominal);

M: money supply (actual);

MD: total money demand;

GT: government transfer payment;

GP: government purchase;

NT: government net tax = government purchase gp;

For example: exit;

IM: import;

K: the response degree of transaction currency demand to income changes;

H: the response degree of speculative money demand to interest rate changes;

A: Technical level;

W: actual salary;

P: actual working hours.