Yesterday Twitter launched itself onto the financial markets by offering a small proportion of its share for sale. The company sold them for $26 each. By the close of the day they were being sold for $44; during the day they had been even higher. Last week The Economist carried out a sober assessment of what they thought the shares were worth. They thought that investors should not pay more than $18. So what is going on?
No new information was revealed last week that might raise the share valuations. Instead we get a lot candyfloss arguments about why investors should buy the shares: arguments that taste sweet but disappear as soon as you try to digest them. There is talk of growth potential and strategic value - but studious avoidance of how much these are already built into the price. For those of us brought up to believe that share values reflect the discounted value of future cash flows this sobering. But serious money is behind the price movements. Who is buying at these stupid prices?
The answer is that people are buying because they think they will increase in value in the short term, and that they can sell out at a profit before any trouble starts. They are not watching long term value; they are watching the other guy. This logic may make some sense for an individual investor (or perhaps more correctly "trader"), but collectively it is madness. It simply leads to asset price bubbles. And there is a lot of it about.
This leads to a massive source of instability at the heart of the world's financial system. But what to do about it? The first thing to say is that the world's central bankers should stop treating asset price bubbles as a minor aberration of the system whose damaging effects can be contained. They are the big deal: a more important source of instability than the consumer price inflation that they still tend to focus on. Such policies as quantitative easing should be assessed in that light.
You can't and shouldn't stop people speculating on financial assets with their own money. Ultimately this leads to more realistic prices. What fuels bubbles is when people speculate with other people's money: "leverage" in the jargon. Banks and financial institutions should lend money for proper investment projects, and a modest amount for purchases of existing property for people to live in or use productively. They should not be lending to speculators. Since 2008 people are more aware of the dangers. Alas we have a long, long way to go.