The savings–investment spending identity says that savings and investment spending
are:
always equal because private savings match government savings.
equal as long as there is no trade surplus or deficit.
always equal for the economy as a whole.
equal as long as there is no government budget deficit or surplus.
In a closed economy, the savings–investment spending identity is:
I = GDP – C – G + (IM – NX).
NS = GDP + (C – T + TR) + (T – TR – G).
In a closed economy government spending was $30 billion, consumption was $70
billion, taxes were $20 billion, and GDP was $110 billion this year. Investment
spending was $10 billion. As a result:
private savings were $10 billion.
the government’s budget balance was a surplus of $10 billion.
there was no net savings.
private savings were $20 billion.
To help increase investment spending, the government can:
lower taxes on consumption, so that disposable income rises.
lower taxes on the returns from savings, so that total savings increase and the
interest rate falls.
raise taxes on the returns from bonds while lowering taxes on stock dividends.
lower taxes on investment spending while raising taxes on savings, so that total tax
revenue remains constant.
According to the savings–investment spending identity:
savings equals investment spending.
government spending equals tax receipts.
total income equals consumption spending plus savings.
savings equals investment spending plus consumption spending.
In a closed economy, national savings equals private savings:
minus consumption spending.
minus investment spending.