When inflation equals the value determined by past expectations and pricing decisions and output equals the level of short-run equilibrium output...inflation the economy is said to be in short-run equilibrium.
Although it may appear through other economic processes, the main driver of inflation is an increase in the money supply. The following options are available to monetary authorities to increase a country's money supply :
All of these circumstances lead to a decrease in the money's purchasing power. There are three different sorts of mechanisms that cause inflation as a result : built-in inflation, cost-push inflation, and demand-pull inflation.
So, option (a) can be regarded as suitable.
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