@miriam98 - We did see some of that, but fortunately the majority of people chose to remain honest. Most people recognized that business people were trying to make an honest living, and therefore did not try to exploit the situation. They waited until the stores adjusted their prices.
The real lesson for me is that this kind of thing can happen anywhere, not just in developing countries. As long as there is a currency market, there will be speculation. I think the U.S. should never have abandoned the gold standard so long ago.