Answers
Why does the exchange rate vary?
There are a lot of economic factors that affects any country exchange rate. The exchange rate in turn respond to the law of demand and supply. A $1 now could be higher or lesser than a $1 in the next 5minutes. It depends on fundamental events affecting the country, as in this example above USA.
A good ecomony attract investors who demands for a currency of any country positively while a bad econony detract investors. Other economic indicators are employment situation, nonfarm payrol, gdp, interest rate, consumer index, ism manufacturing and non manufactoring index, national economy polities etc etc.
How do currency values rise and fall? Why would a country want to manipulate the value of its own currency?
i need to know the exchange rate from american money to the money in zambia by tomorrow
$1 = 3,705.50 kwacha
If the exchange rate falls from 10 francs per dollar to 6 french francs per dollar then from the perspective of an American consumer, what happens to the attractiveness of french goods?
The dollar has weakened; which in the US hurts the demand for french products.
Using your example, here's why.
Assume a bottle of French wine is 100 francs.
This used to cost an American $10.
At the new exchange rate; it now costs $16.67.
Can anyone tell me the exchange rate for the American Dollar and the Pound?
Serious answers only... Thanks!
1 pound 1.96950 USD
On frequent time slot the exchange rate between any two currencies changes. I believe this is done with a 15 minute delay. How is the final rate for the day determine. That is the rate that gets reported in most news briefings at the end of the day?
There is no delay. There is not a final rate, I believe it is a 24hr market. The spot rate is calculated from the Interbank rate. Other banks, dealers, bureaux can quote what price they like.
To answer your question the rate is decided by supply and demand. The rate is based on very large currency trades (between 9 major banks, I believe)
US Faults China Lack of Exchange-Rate 'Flexibility' - Bloomberg
AFP US Faults China Deficit of Exchange-Rate 'Conformableness' Bloomberg Oct. 15 (Bloomberg) — The US Moneys Worry criticized China for the “be of resiliency” of the yuan and a buildup of transpacific-exchange reserves while stopping suddenly of branding the realm a manipulator of its currency. … Wonderful at risk from China forex regulation: Funds MarketWatch Delivery declines to cite China on currency The Associated Request U.S. declines to name China forex manipulator Reuters AFP - The Responsibility Insider - Brick up Lane Roll (blog) all 157 tidings articles »

Source put:
News
Citi To Issue Less Than $15 Bln In Long-Term Debt Next YearWall Street Journal - Oct 16, 2009
Citi Treasurer Eric Aboaf said, "The dollar exchange rate movements, as most of the major exchange rates around the world, are something we are clearly and more »MarketWatch - Oct 16, 2009
Shanghai volatile as PBOC talks of interest-rate 'exit strategy'Beijing, she said in a note to clients Friday, would likely look again to the yuan's exchange rate at a time when consumer and producer prices appear to be and more »Wall Street Journal - Oct 15, 2009
Colombia Reports"We are working to evaluate different options considering that the current levels of the exchange rate are out of the equilibrium, which generates problems Colombia's Peso Falls on Bets Government to Weaken Currencyall 24 news articles »
The Australian - Oct 16, 2009
Inside RetailingExporters suffer as Aussie's swift rise continues"It's all very well to say people understand that it is the exchange rate, but to a buyer in the US, they are paying 40 per cent more than they were six When the buck charges, a world of markets turns bullishPimco Bullish on Aussie as Barclays Sees ParityWhat does the rba's board do? - -all 639 news articles »
Reuters - Oct 16, 2009
EU's Juncker:continued euro rise may become a problem"I'm not concerned too much by the exchange rate we are observing. But if it continues in the way it started weeks ago, I could become concerned at a and more »