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Similarly, if a national economy runs a trade surplus, the trade sector will involve an outflow of financial capital to other countries. A trade surplus means that the domestic financial capital is in surplus within a country and can be invested in other countries.

The fundamental notion that total quantity of financial capital    demanded equals total quantity of financial capital supplied must always remain true. Domestic savings will always appear as part of the supply of financial capital and domestic investment will always appear as part of the demand for financial capital. However, the government and trade balance elements of the equation can move back and forth as either suppliers or demanders of financial capital, depending on whether government budgets and the trade balance are in surplus or deficit.

Domestic saving and investment determine the trade balance

One insight from the national saving and investment identity is that a nation’s balance of trade is determined by that nation’s own levels of domestic saving and domestic investment. To understand this point, rearrange the identity to put the balance of trade all by itself on one side of the equation. Consider first the situation with a trade deficit, and then the situation with a trade surplus.

In the case of a trade deficit, the national saving and investment identity can be rewritten as:

Trade deficit  =  Domestic investment – Private domestic saving – Government (or public) savings (M – X)  =  I – S – (T – G)

In this case, domestic investment is higher than domestic saving, including both private and government saving. The only way that domestic investment can exceed domestic saving is if capital is flowing into a country from abroad. After all, that extra financial capital for investment has to come from someplace.

Now consider a trade surplus from the standpoint of the national saving and investment identity:

Trade surplus  =  Private domestic saving + Public saving – Domestic investment (X – M)  =  S + (T – G) – I

In this case, domestic savings (both private and public) is higher than domestic investment. That extra financial capital will be invested abroad.

This connection of domestic saving and investment to the trade balance explains why economists view the balance of trade as a fundamentally macroeconomic phenomenon. As the national saving and investment identity shows, the trade balance is not determined by the performance of certain sectors of an economy, like cars or steel. Nor is the trade balance determined by whether the nation’s trade laws and regulations encourage free trade or protectionism (see Globalization and Protectionism ).

Exploring trade balances one factor at a time

The national saving and investment identity also provides a framework for thinking about what will cause trade deficits to rise or fall. Begin with the version of the identity that has domestic savings and investment on the left and the trade deficit on the right:

Domestic investment – Private domestic savings – Public domestic savings  =  Trade deficit I – S – (T – G)  =  (M – X)

Questions & Answers

discuss advantages and disadvantages of international trade.
Ram Reply
how can I ask the question here . tell me anyone plz I'm new user so kindly help here I will click ......?..🤗
ISRAR
me . I'm *
ISRAR
So kindly help me. where I will click......***
ISRAR
What are the reasons of demand pull inflation
GIRIDHARI Reply
the reasons behind pull inflation are high rate of interest
Ahmed
yes
M-H-S
in other hand when demand of specific commodity is high and its supply is low there will be inflation of price
Ahmed
Thank you
GIRIDHARI
you are welcome
Ahmed
thank you
Mohamed
what is barter system
twinkel Reply
a system in which goods are exchanged for other goods
daniel
Barter system is said to be the process whereby goods are being exchange for goods
Asamoah
a system in which money have not play any role
Ramu
goods and services are exchanged .. problem is finding equitable or agreeable value for the exchange of the goods or services.. I teach maths privately and love home made cake, I decided 4 home made cakes was worth an hour of private maths 😁
jax
ok.thank u
twinkel
thanks a lot to everyone .
ISRAR
accounts in balance of trade
Kamuyu Reply
What is fiscal policy and intrest rates
Attah Reply
fiscal policy is the use of govt. revenue collection and expenditure to influence the economy.
twinkel
income and expenditure
Bittu Reply
Macro economics : it is the study of all aggregate of all economic activities of an economic as whole.
Rajat Reply
what is macro economics
Sarah Reply
it is study of all aggregate of all economic activities of an economic as whole.
Rajat
Macro economics is the aggregate study of national income, investment, price level, changes in economic activities, GDP and economic inflation.
Zahid
hey
Ahmed
how are you
Ahmed
thanks
Ahmed
i am find
Ahmed
what about you
Ahmed
am good bro
Ahmed
am fine
Ahmed
what is comparative and superlative advantage? give an example
Xanaan Reply
Methods used to correct trade deficits?
David Reply
what is role capitalism unemployment?
Mafsuud Reply
being unemployment look job but not achieved their being out labor force is person can't work
Mafsuud
being unemployment look job but not achieved their being out labor force is person can't work
Mafsuud
themes studied in economics include?
Patrick Reply
Financial accounting GDP and GNP
Samson Reply
can u explain
Sarah
this means that the demand curve have negative relationship with the price ..which means that when high price low demand of the product and vice versa so higher price will shirnk the demand of product
Ahsan Reply
Higher price level ∴Real value of household wealth increase ∴Net export decrease ∴More money needed, interest rate increase, investment decrease
sirius
net export decrease
Cyril
a person has 60birr to buy two commodities,x and y the price of x is four birr unit the price of y is two birr unit his utility functio given by u=xy+2x determine the budget equation
Mohammed Reply
the budget equation will be- 60 birr= 4x+2y
Ramu

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Source:  OpenStax, Macroeconomics. OpenStax CNX. Jun 16, 2014 Download for free at http://legacy.cnx.org/content/col11626/1.10
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