INJECTIONS AND LEAKAGES
When money is taken out from the circular flow of economic activity we call it a leakage (or withdrawal), and when money is put into the circular flow we call it an injection.
Injections (J) is an expenditure that does not originate from household and will increase the level of economic activity - investment spending (I), government spending (G) or export receipts (X).
Leakages or withdrawals (W) that will decrease the level of economic activity are savings (S), taxes (T) and import payments (M).