**The Financial System:**

The financial system is the system of financial markets and
intermediaries through which households supply funds/money and firms demand
it. Financial markets are markets where
stocks and bonds (also known as securities) are traded. Financial intermediaries are companies
including banks, insurance companies, mutual funds, and pension funds that
borrow money from the savers in the economy and lend the money to borrowers.

**Why Savings equals Investment:**

Using the GDP equation to explain saving and investing:

Begin with our GDP equation for an open economy:

Y = C + I + G + NX

To simplify this idea, let’s look at a closed economy, where
there are no imports or exports. This
means that NX will equal 0 and will therefore drop out. This leaves us with:

Y = C + I + G

We can rearrange this equation to solve for investment (I)
as a function of the other variables in the economy:

I = Y – C – G

This equation tells us that investment in the economy will
be equal to the total amount produced (GDP = Y) minus consumption spending, and
government purchases.

Now we can create a savings for the economy equation. The total amount of private savings (savings
by the private sector meaning households and firms) is going to be equal to the
amount produced (Y) plus transfer payments from the government (we will call
this TR, and include things like unemployment, social security and welfare)
minus the amount spend on consumption (C) and taxes (T).

S(private) = Y + TR – C – T

Hopefully this makes sense, the amount you save (S) will be
whatever is left over (starting from initial money of Y and TR) after you
account for spending and expenses (C and T).

Now we need to consider public savings, which is how much
the government saves. Public spending
depends on the amount of taxes they receive (T), the amount they spend in
purchases (G), and the amount they transfer to the population (TR). The public savings function will be:

S(public) = T – G – TR

We can find the total amount of savings (S) occurring in the
economy by adding public savings to private savings.

S(public) + S(private) = S

T – G – TR + Y + TR – C – T =S

Note that T and TR cancel out. This leaves us with savings (S) being equal
to GDP (Y), government purchases (G), and consumption (C):

S = Y – G – C

If we plug in the GDP equation for Y, or substitute C + I +
G for Y we get:

S = C + I + G – G – C

Note that C and G will cancel out leaving us with:

S = I

This shows that the total amount of savings occurring in the
economy is equal to the amount being invested.
Remember that investment leads to the accumulation of capital which
leads to increased labor productivity which leads to economic growth (which is
a good thing). So having high amounts of
savings is good for economic growth.

Note that it is possible to have negative amounts of saving
or dissaving. For example, if T is less
than G + TR then public saving will be negative. Also, is C + T is greater than Y + TR then we
will also have negative private saving, but this is very rare.

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ReplyDeleteIn a closed economy, I=S. But do not forget, that I contains also investments into inventories. So if people save more (= do not consume), additional funds (which should be reflected in a lower interest rate) may stimulate either firms to invest into productive investments, which is good for the economy, or force them to "invest" into inventories, which means "unsold production" and to lower the production in the next period because of falling demand, which is bad for the economy. Households may invest their savings too (for example house is also a part of investments in national accounts).

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