Foreign Currency Conversion Unfair: Have this come across your mind?

The scenario is that it is best to earn income from a country with higher currency value and spend the money to the country with low currency value. I hope I am right with this.

Economy IS mysterious. And incredibly complex to folks like us who aren't in the know. But some countries do manipulate the value of their currency, I believe China has been doing this to keep its economy more competitive and the IMF(?) was giving them some trouble about this? If you want to read a mindblowing article (about how economy seems to hang from a thread), read this: http://www.straightdope.com/classics/a3_163.html

Splitzip thanks for the interesting link! ru88en that is quite right; I know a couple of people who work 6 months of the year in the U.S. then live and spend the other 6 months of the year in Russia, it works out quite well for them financially.

that is clear but it doesn't explain what makes the economy stronger in the one place and weaker in the other place. actually, it doesn't even define what 'stronger' and 'weaker' mean in this sense.

The link up there explains most of it :)

Your answer make sense to me. Just one question. If there is one to be called a universal currency today then that is a dollar. I hope you agree. Being a universal currency position the dollar to be very much in demand. My question is how come some countries have a higher value that the dollar? I hope, you can drop by again to this topic...

Check the first link I posted, it's exactly about currencies that are worth more than the dollar, but they're from countries with (arguably) weaker economies than the US. It seems confusing doesn't it? But more factors other than supply/demand also interfere with the currency exchange rates. To summarize: "There is no necessary relationship between the exchange rate of a foreign currency relative to the U.S. dollar and the strength of the issuing country's economy or its wealth. Consider a few examples. Some of the strongest currencies other than the U.S. dollar (that is, ones preferred by investors, because their value is stable) are the British pound (at 0.63 per dollar), the Japanese yen (at 116 per dollar), the Swiss franc (at 1.40 per dollar), and the European euro (at 0.90 per dollar). The yen is a particularly striking case. Although the Japanese have had their problems in recent years, they still have one of the largest economies in the world and are wealthy by any standard. Yet one yen is worth less than a penny. (...) Another way to think about currency exchange rates is that they're like stock prices. The fact that one company's stock price is higher or lower than another's doesn't necessarily tell you anything about which company is stronger or the better investment. You decide that based on the movement of the price over time." That article is a long read, but if you want to know a bit more about this subject, it clears up a few things :)