It depends all on new investment opportunities; this requires a macro-prudent interplay of the state, the economy and the markets. In this sense, interest rates do reflect economic opportunities of growth as the JvNeumann formula (first link) states.
This is an old question in the literature. Difference in Wicksell's two interest rates--the natural and the money rate, leads to price changes and money then is not neutral. This was the transmission mechanism Wicksell gave to the old quantity theory of money. In modern times it takes the form of "money matters" vs. "money does not matter" between the Keynesians and the Monetarists, respectively.
According to the economic literature, monetary policies are transferred to the economy, through different mechanisms, among which are:
1. Interest rates. This is the main mechanism that central banks use to apply monetary policies. At a lower interest rate, investment and consumption are encouraged (expansionary policy); at a higher interest rate, investment and consumption are discouraged but savings are encouraged (contractive policy).
2. Open market operations (OMO). It consists of the issuance of debt securities by central banks, so that the public acquires them, and in this way withdraws money from the economy. Likewise, by withdrawing debt securities, this would be injecting money into the economy.
3. Bank reserve requirements. This consist of a percentage of reserve that commercial banks must have, for eventual economic emergencies. When the monetary reserve increases, there is less availability of money to put in the economy, indirectly causing an increase in interest rates (cost of money over time). On the contrary, when the monetary reserve falls, there is greater availability of money to put in the economy, indirectly causing a decrease in interest rates.
Clearly these are the main and most famous mechanisms used by Central Banks to control monetary policy, however, in practice, there may be others.
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The transmission mechanism has been studied for years. The various channels are interest rate, credit, asset prices (bonds, stock, commodity and housing), exchange rate, wealth effects, among others. This follows from what is money and we can find a channel from there. The virtual and digital currency used will become a channel soon.
The transmission mechanism from moving influence of monetary policy to real economy is simply the applications of monetary policy tools: OMO, INTEREST RATE, exchange rate, moral suasion, assets prices (stocks, shares and bonds,treasury bills), use of stabilization securities on the real economy, among others the government chooses to apply.