Perfectly explanatory post!
I would like to add just a little info that helped me a lot to frame out the analytic functioning of inflation/deflation through monetary policy, that is the notion provided by the
Quantity theory of money.
It basically relies on a simple mathematical law, that in its exemplified form is known as
equation of exchange:
M x V = P x Q
Where
M is the money circulating supply,
V is the velocity of money, or the frequency of transactions in a given period of time(basically how fast money flows in the economy),
P is the average price level,
Q is the real value of goods.
The left-hand member of the equation is the
money supply (MS = MxV), while the right-handed one is the
money demand (MD = PxQ) and the relation between the two basically states that in an economy all the actors cannot spend more than how much all the actors produce (gain).
Note that
MD can also be referred to as the
nominal GDP.
Assuming
V and
Q as
constants, (the velocity of circulation of a simple medium of exchange V depends on consumers habits, and the value of goods Q is produced in a situation of full employment -Fisher- and objective), if the monetary policy maker decides to inject money in the system, alias printing new money (increasing the value of M value in the equation), in order to maintain the law (equation) prices must necessarily increase proportionally (Increasing the P value in the equation).
This increase of P is what we call
inflation.
If instead of increasing M, we decrease it (destroy money), in order to keep the law valid prices (P) must decrease as well, proportionally. That is what we call
deflation.
This model gives an analytic reason on why abundance of money leads to inflation, while scarcity leads to deflation, and why Bitcoin tends to gain purchasing power (facing decreasing supply over time, thus decreasing purchasing price levels for goods, that is to say higher value for itself), while FIATs tends to loose it (facing increasing supply, thus increasing price levels for goods, or lower value for itself).