http://www.nakedcapitalism.com/2013/11/pettis.html
Investors in Chinese markets must be speculators if they expect to be profitable. As long as this is the case, investors will not behave in a way that promotes the most productive capital allocation mechanism in the market, and such efforts as bringing in foreigners will have no meaningful impact.
What China must do is something radically different. It must downgrade the importance of speculative trading by reducing the impact of non-economic behavior from government agencies, manipulators, and insiders. It must improve corporate transparency. It must continue efforts to raise the quality of both corporate reporting and national economic data. Finally, it must deregulate interest rates and open up local markets to permit arbitragers to enforce pricing consistency and to allow better estimates of appropriate discount rates.
If done correctly, these changes would be enough to spur a major transformation in the way Chinese investors behave by permitting them to make long-term investment decisions. It would reduce the profitability of speculative trading and increase the profitability of arbitrage and value investing, and so encourage a better mix of investors. If China follows this path, it would spontaneously develop the domestic investors that channel capital to the most productive enterprise. Until then, China’s capital markets, like those of many countries in Latin America and Asia, will be poor at allocating capital.
When efficient markets become inefficient
But this is not just an issue for China. In the US there have been times when markets seemed efficient and rational, and times when they clearly were not. Of course this cannot be explained by the disappearance of the tools needed by value investors – for example the market for internet stocks seemed rational in the early 1990s and clearly became irrational by the late 1990s, but this did not occur, I would argue, because fundamental investors were suddenly deprived of their analytical tools.
What happened instead, I would argue, is that conditions that led to a too-rapid expansion of liquidity at excessively low interest rates changed the environment in which fundamental investors could operate. As excess liquidity forced up asset prices, the likes of Warren Buffet found themselves unable to justify buying assets and so they dropped out of the market. As they did, the mix of investment strategies shifted until the market became dominated by speculators, and when this happened what drove prices was no longer the capital allocation decision of value investors but rather than short-term expectations of changes in demand and supply factors that characterize a highly speculative market.
This, I would argue, made the US stock market of the late 1990s (and perhaps today, too) “irrational”, not because they are fundamentally irrational or inefficient but rather because they can only function efficiently with the right mix of investment strategies. When the mix was altered – and this can happen when liquidity is too abundant, or when a sudden shock undermines the confidence value investors have in their ability to analyze data, or when a political event cause uncertainty to rise so high that value investors are priced out of the market, or for a number of other reasons – the markets stopped functioning as they should.
Perhaps what I am saying is intuitively obvious to most traders or investors, but it seems to me that it suggests that the argument about whether markets are efficient or not misses the point. There are certain conditions under which markets are efficient because the tools needed for each of the various investment strategies are widely available and ate credible. When those conditions are not met, because the tools are not available, or when they are temporarily overwhelmed by exogenous events, perhaps because the credibility of those tools are temporarily undermined, or when excess liquidity causes fundamental investors to drop out, markets cannot be efficient.