The risks of changing course cannot be overstated.

Soaring energy prices, for example, have become a leading inflation risk.

This is boosting the prices of other risky assets such as equities and credit.

The loss of public confidence that may result from not acting may be even higher than the cost of governmental regulation indeed, this loss recently resulted in billions of dollars of reductions in the value of shares.

So it is right to take the risks that change requires.

It is impossible to infer solely from an increase in the volume of transactions how the price of oil will change.

The risk to home prices in the aftermath of a bubble is real and substantial.

Stock options reward executives generously even when shares rise because of a price bubble and even when comparable firms shares are performing better.

And it is difficult to argue that weak demographics is the main driver of strong stock prices, though some have tried.

Some recent rises in the prices of equities, commodities, and other risky assets is clearly liquidity driven.

Of course, there is no glee in seeing stock prices tumble as a result of soaring mortgage defaults.

If we re taking about the stock market, the depreciation of the rouble somewhat mitigates the decreasing price of stocks denominated in roubles.

From climate change to volatile oil prices, all signs point to a looming global energy crisis.

To be clear, measured price changes implemented over time was never in dispute indeed, some internal price adjustments for Ukraine were in order.

The rise in equity prices has not come with a contagious new era story, but rather a sigh of relief story.

Monetary policy has been prudent, and the threat of inflation has now been lessened by the decline in commodity and oil prices.

For Africans, however, these changes are cosmetic, doing little or nothing to lift cotton prices.

The historic volatility of oil prices reflects these psychological shifts as well as changes in objective reality.

Stock prices dropped.

During World War II, for example, political support for great fortunes diminished and the government sharply increased taxes on capital gains, dividends, and high incomes in general.

In particular, tax rates that affect stocks have varied through time as political pressures change.

Financial market deregulation in an un named country sets off a credit boom and an explosion in equity and real estate prices.

Indeed, US and global equities have vastly outperformed gold since the sharp rise in gold prices in early 2009.

Responses to a survey that my colleague Karl Case and I conducted in 1988 during the US boom revealed that casual word of mouth transmission of emotional excitement played a big role in purchasing decisions.

Buyers were influenced by strong expectations about future price increases, and they perceived little risk.

For most people, the troubles caused by the old age crisis seem remote, while booming share or housing prices look concrete in brokerage statements or on the business pages of newspapers.

On the contrary, economic theorists have been puzzled by the historical rate of increase in the stock market, which they call the equity premium puzzle.

I don't care about the risk.

The latest increases in oil prices and the related increases in other commodity prices, especially food imply several unfortunate consequences (even leaving aside the risk of severe civil unrest).

For most people, the troubles caused by the old age crisis seem remote, while booming share or housing prices look concrete in brokerage statements or on the business pages of newspapers.

(Bolivia may, of course, not want to bear the risk of a fall in the price, so it may strike a deal to transfer some of the downside risk to foreign companies, giving them in exchange more of the upside potential.)

But what does such liquidity mean, and is there really reason to expect that it will sustain further increases in stock and real estate prices?

Video of the performance was posted on Vimeo.

Agent metaphors describe price movements as the deliberate action of a living thing, as in, The NASDAQ climbed higher.

Object metaphors describe price movements as non living things, as in, The Dow fell like a brick.

But Sarkozy took the risk.

I'll risk it.

We'll take that risk.

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.

If we do not start to combat the flow of greenhouse gas emissions now, the stock in the atmosphere will continue to grow, making future action more difficult and costly. Other public expenditure can be postponed, but delaying climate change measures is a high risk, high cost option.

Other public expenditure can be postponed, but delaying climate change measures is a high risk, high cost option.

We cannot explain this convergence in terms of standard economic arguments, such as changes in relative prices and incomes, because no such changes were sufficiently large.

Given the potency of the recent oil price shock, the risk is that inflation may temporarily slip into negative territory in the coming months.

An increase in the stock price of steel manufacturers suggests an increase in the demand for steel, which induces entrepreneurs to start more steel plants and investors to provide them with the money.

In fact, a major boom in real stock prices in the US after Black Tuesday brought them halfway back to 1929 levels by 1930.