Targeted Monetary Policy

An Idea I had while commenting on Reddit:

I think one lesson learned from this experience is that monetary policy needs to be directed towards particular sectors of the economy rather than being a broad action.

This would mean that the agency involved in setting monetary policy (a country's central bank) would actively and directly engage in important internal markets. And by engage I'm talking about buying and selling.

Of course the guiding principle should be price stability rather than making profits. A central bank can make huge profits or losses - but since it has the power of seigniorage, neither should affect it in any way (it can't go bankrupt).

It would work like this:

Let's say that an asset-price bubble appears in the share market. P/E ratios are going through the roof and people are making money simply by buying in the morning and selling in the afternoon.

The Central Bank would then directly enter the market by selling shares - shorting. This process would continue until P/E ratios begin to drop to realistic levels.

**Of course one important factor is that the share market would know and expect a direct entry into the market by the central bank once p/e ratios began getting too high. Knowing that the central bank would respond would affect their own behaviour and thus the market would end up being self-correcting**

Apply this same principle to asset price bubbles in other areas of the economy, such as property, resources, etc. ie any sector which is undergoing substantial growth and which constitutes a significant portion of the economy. The Central Bank would not act if the sector of the economy is very small, for example.

Also apply this same policy tool to achieve a reverse effect when prices are low and getting lower.