America's spendthrift households might react to falling share prices by sharply raising their savings.
And falling share prices make this a terrible time to sell unwanted foreign assets.
Falling share prices undermine corporate and individual wealth and could in turn weaken economic activity.
Falling share prices and a weakening jobs market suggests consumer confidence should begin to erode as well.
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So perhaps their desire for gorgeous cars will survive falling share prices and the uncertain economic outlook.
Yet, as falling share prices made some households feel poorer, rising house prices have made many more feel richer.
Such simulations isolate the impact of falling share prices on the British economy.
Many economists were worried last year that the wealth loss from falling share prices would force consumers to cut their spending.
Since the main stockmarket indices peaked late last month, falling share prices have gone hand in hand with rising bond prices.
That might be more attainable if they had less capital, and indeed their falling share prices have done a good job of reducing the problem.
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Dividend yields on companies that make PCs or parts have risen this year, both on falling share prices and direct appeals from corporations to investors.
In Asia, Japan restricted investor bets on falling share prices, so-called "short selling, " to try to end a stock market slide that has particularly hit its banking sector.
The banking and insurance sectors have been subject to increased competition and this, as well as falling share prices, have led to increased merger activity in the sector.
Much of the money has come from Europe, in particular from Spain, a fact that was reflected in falling share prices, especially of banking stocks, when the Madrid Stock Market opened on Thursday.
But companies that have in the past arrogantly dismissed their concerns as irrational or minority views have paid, as did Coca-Cola, Nike, Ford and Monsanto, with falling share prices, profits and even their chief executive's jobs.
The most sweeping intervention of all came from Ireland's government, where concerns about spiking credit-default swap (CDS) spreads, falling share prices and jittery depositors led the finance minister to announce, on September 30th, a blanket guarantee on the deposits and almost all the debts of the country's six biggest banks until September 2010.
It was intended to boost confidence at a time of falling share and house prices.
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And with share prices falling, cash-rich firms will then be in the strongest position to pursue their ambitions.
If this does not stop America's share prices falling, what will?
Both have suffered from confusion, falling profits and diving share prices.
But both share prices falling means that the markets thought that this particular deal was wealth enhancing, the News International price falling (at least in part) because that value will now not be created.
He backed the UK's recent ban on short-selling - in which traders bet on share prices falling - and said Britain and other governments "should not lose their nerve as they look to identify a few more targets".
But now that share prices are falling again, some business has already vanished.
Rising share prices and falling interest rates had prompted some of Brazil's mutual funds to switch from bonds to equities.
Motor fuel also accounts for a larger share of Americans' spending, so falling prices will depress inflation by more.
With no QNX on handsets until CY12, we think RIM will likely continue to lose share to Android smartphones whose prices are rapidly falling.
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Dell faces a barrage of competition from players like HP, Lexmark and Samsung that will make it hard for Dell to gain significant share in printers or displays to offset the impact of falling hardware prices.
It also suggests investors look for companies that have had to contend with falling prices for years and have still managed to generate robust earnings-per-share growth.
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