Now exchange rates are floating, i.e. they are defined only by participants of the market on the basis of a supply and demand. Earlier in the currency market there was a big stability of exchange rates. The price has some objective maintenance and it can be calculated.

The exchange rate of one currency to another can  be calculated on the basis of  purchasing power parity. The main idea of this approach consists in the following: if you have $100 you should have possibility to buy  exactly as much  goods as you could buy on $100 in the USA having arrived in Germany and having exchanged these dollars for euro. For such calculation it is necessary to define baskets of the goods and to estimate costs of these baskets in each currency. The parity of costs of such baskets  will be an exchange rate of the given currencies. But there are big difficulties for calculation of purchasing power parity of currencies as it is practically impossible to define standard baskets for purchasing power comparison in the different countries.This difficulty is caused not only geographic location or cultural  distinctions of the countries.

The second way of calculation of exchange rates - inflation comparison in two countries.Where it grows faster the currency faster becomes cheaper and speed of a exchange rate changing should be co-ordinated with speed of changing of inflation to remaine the purchasing power parity. But it is difficult to define the base period of time   for comparison of exchange rates and inflation. Besides,

• inflation changes non-uniformly for different groups of the goods that reduces objectivity of such estimation;

• measurement of the inflation does not differ sufficient accuracy.

The third way of exchange rates calculation   is based on comparison of interest rates in the different countries. Naturally, it is necessary to examine both nominal interest rates and real and consequently we will be compelled to use an inflation indicator again.

There are also variants of exchange rates calculation  on the basis of the analysis of the size of the monetary offer or using «portfolio» approach. But any of ways of exchange rates calculation  does not give those values which exist in the real market. Use of such calculations for short-term forecasting of exchange rates  is senseless. Our online pharmacy is the perfect resource for people to get their drugs without any hassles or awkwardness. buy cialis We work hard to make sure you save money every time you shop with us. buy levitrabuy soma At our online store, you pay less and get more. buy viagra