Evidence that is based on a variable having its effect on another variable through channels rather than a direct effect is known as

Monetary policy transmission mechanisms are the channels through which changes in policy rates affect economic variables, such as prices and output. The transmission mechanism is characterized by long, variable, and uncertain time lags, making it difficult to predict the precise effect of monetary policy actions on the economy and price level.  The transmission of monetary policy can be summarized in two stages: Changes to monetary policy affect interest rates in the economy. Changes to interest rates affect economic activity and inflation.  The four key channels of monetary policy... Show more

Monetary policy transmission mechanisms are the channels through which changes in policy rates affect economic variables, such as prices and output. The transmission mechanism is characterized by long, variable, and uncertain time lags, making it difficult to predict the precise effect of monetary policy actions on the economy and price level. 

The transmission of monetary policy can be summarized in two stages:
Changes to monetary policy affect interest rates in the economy.
Changes to interest rates affect economic activity and inflation. 

The four key channels of monetary policy transmission are: interest rate, credit aggregates, asset prices, and exchange rate. 
The interest rate channel is the dominant transmission mechanism of monetary policy.

Other channels of monetary policy transmission include: Consumption and investment decisions, Expectations, Equity and real estate prices, Bank lending, and Firm balance sheets. 

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