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Can I predict if it is better to save money in USD or local currency? 
Typically, the higher interest rates in local currency cover about the potential gain from the currency exchange rate change - if not, people would make money out of it. However, you only know this after the fact, so either way you are taking a risk. Depending on where the local economy goes, it is more secure to go with US$, or more risky. Your guess is as good as anyone. If you see a chance for a serious meltdown of the local economy, with 100+% inflation ratios and possibly new money, you are probably better off with US$. On the other hand, if the economy develops better than expected, you might have lost some percentage of gain. Generally, investing in a more stable currency gets you slightly less, but for less risk.