One could say it has to do with export to import ratio. Also major items like oil,gold, and other cash resources make alot of money and help boost the economy. Also some countries have debt like america so there international value is high in some areas and low in others.
Capital. The former communist countries were not prepared to guarantee the safety of capital, and did not have the infrastructure to support it. Some have made remarkable leaps toward capitalism (East Germany, Czech Republic) while others are still somewhat behind (Romania). Still, as capital becomes safe, their currency stable, and unions become less important, they are able to compete for capital improvements, resulting in job growth, improvements in education and worker pay.