In the markets In the context of stock trading on a stock exchange, the bid price is the highest price a buyer of a stock is willing to pay for a share of that given stock.

Barclays stock price rose slightly on the news.

Indeed, in a volatile speculative market, where people buy and sell in anticipation of further price movements, history confirms that price movements will be hard to explain, even after the fact.

Its stock price is a component of the Dow Jones Industrial Average.

Unfortunately, this behavioral theory of stock market movements is not amenable to easy quantification and forecasting.

What should be done about this? For starters, executives payoff from stock sales should not depend on a single stock price.

The stock price of Halliburton, Vice President Dick Cheney s old company, has soared.

Stock markets unusually negative skew is not inconsistent with booming price growth in recent years.

In the past, whenever price earnings ratios were high, future long run stock returns were low.

Stock market movements are certainly hard to explain, but there are reasons to believe that Brazilians might be rationally exuberant.

The deficiency of IFRS is that it does not mitigate systemic contagion resulting from asset price movements.

Rather, the payoff should be based on the average stock price over a significant period of time.

Issuing the stock to the public at an inflated price a year ago, the shares initially traded even higher.

The trade of African countries is still dominated by commodities, which are subject to volatile price movements beyond their control.

We examined the extent to which firms earning announcements surprised markets (as reflected in stock price reactions to these announcements) and stock analysts (as measured by the gap between announced and forecast earnings).

With the price earnings ratio remaining stable and moderate, the stock market boom does not appear to reflect merely investor psychology.

Under one possible arrangement, executives seeking to cash out shares would sell them to the company in return for a price based on the average stock price during, say, the subsequent six months.

In new empirical research, Alma Cohen, Charles C.Y. Wang, and I show how stock markets have learned to price anti takeover provisions.

Other models have large quarterly shocks to the depreciation rate in the capital stock (in order to generate high asset price volatilities)...

My Harvard colleague Kenneth Froot and I once studied the relative price movements of a number of goods over a 700 year period.

Until recently, the US asset price bubble first in the stock market, then in real estate masked the underlying depreciation of American enterprises.

After all, in the 1990 s, the US stock market surge (as in many countries) was fueled by record high price earnings ratios.

Increasing risk tolerance on the part of stock market investors, which appears to have raised long run price earnings ratios by around 20 .

Similarly, equity incentives should be subject to substantial limitations aimed at preventing executives from placing excessive weight on their firm s short term stock price.

Trading on the momentum of price movements may then become a rational activity that becomes self fulfilling, as investors decide to ride the bubble while it lasts.

The stock price of Halliburton, Vice President Dick Cheney s old company, has soared. But even as the government turned increasingly to contractors, it reduced its oversight.

Conversely, a decrease in the stock price of steel manufacturers leads entrepreneurs to liquidate existing plants and dissuades investors from committing more resources to the sector.

They found that the median real stock price appreciation from 1920 to 1996 for all these countries was only 0.8 , compared to 4.3 for the US.

As a result, the average stock price during the payoff period would more accurately reflect the stock s actual value, improving the link between pay and performance.

The incentives to try to hack such accounts are obvious not only significant publicity for hackers, but highly lucrative profit opportunities from the almost inevitable stock market movements that will result.

This week in Amman, a series of events and debates are planned that aim to take stock of the year and delve into where some civic movements stand, conversations camped on

Worse, in America stock options became a preferred form of compensation often worth more than an executive s base pay. Stock options reward executives generously even when shares rise because of a price bubble and even when comparable firms shares are performing better.

But, because they are freely tradable, they can be used to mount bear raids a type of stock market strategy by which a trader (or group of traders) attempts to force down the price of a stock to cover a short position.

Current inflation is more broad based than it appears, regardless of the controversy surrounding the adequacy of China s CPI basket in reflecting the reality of underlying price movements.

By contrast, the run up in stock prices in Brazil started from a very different point, with the price earnings ration as low as six in 1998.

A second problem with executives being free to time the sales of their stock options and shares is that such freedom provides them with an incentive to use their influence over company disclosures to rig the stock price from declining before they execute their trades.

But it makes the case for novel measures, including guidance ranges for asset prices and targeted variation of margin and capital requirements, to help dampen such excessive price movements.

(This behavior is, of course, not unlike that of many other financial assets, such as exchange rates or stock prices, though gold s price swings may be more extreme.)

A study by Philippe Jorion and William Goetzmann found 39 countries with reliable stock price data though not dividend data for a good part of the twentieth century.

Indeed, one of the big puzzles of the US stock market recently has been low price volatility since around 2004, amid the most volatile earnings growth ever seen.

The freedom to time the moment they cash out enables executives to use the special knowledge they have about their companies to sell before a stock price decline.

Shareholder democracy simply does not work, but managers fear that if the stock price drops too low they will be out on their ears provides a useful restraint.

The US government has been particularly aggressive in supporting the stock market since the peak of the equities price bubble in 2000, most notably cutting interest rates repeatedly.

There is a perennial temptation to focus on even to overemphasize the short term, tactical drivers of commodity price movements, at the expense of giving longer term, structural factors their due.

Those that did appear generally seem to be based on the assumption that minor fluctuations in construction costs, not massive market swings, drove the modest home price movements that they noted.