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What are the meanings of symbols in macroeconomics?
The meanings of macroeconomic letters and related abbreviations are arranged as follows for reference only.

A: Technical level; W: actual salary; P: GDP of actual working hours: GDP = C+I+G+(X-M) = C+I+G+NX (expenditure method).

; GNP: gross national product

NDP: net gross domestic product (NDP=GDP- depreciation); NNP: net gross national product (NNP=GNP- depreciation); Ni: national income =Y

C: (consumption) residents' consumption expenditure; PI: personal income; DPI: disposable personal income; CPI: Consumer price index; Producer price index: producer price index

CRB: commodity futures price index; L: total labor force (l = n+u); U: unemployment rate (u = u/l); N: employment rate (n=N/L)

ECI: employment cost index; N: employment; lose one's job

1. (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)

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: transaction capital requirements

Ki: investment multiplier (+); Kg: government purchase 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 δK = 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; save

IS curve _: the equilibrium of commodity market; LM curve: the supply and demand of money 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: Demand for speculative funds

M: money supply (nominal); M: money supply (actual); Total money demand

GT: government transfer payment; GP: government purchase; New Taiwan dollar: government net tax = government procurement GP

For example: exit; IM: importing

K: the response degree of transaction currency demand to income changes; H: The response of speculative money demand to interest rate changes.