Why us dollar rise and drop sometimes ? Is it safe to invest in Singapore dollar ? SGD got 0.003% inflation only. How bout gold ? Will gold drop to USD 200 per ounce then rise back again ? When is the best time to buy us dollar,buy gold coins/bars and sell gold ? Gold bars like credit suisse or commemorative gold coins to buy ? Gold bars or commemorative gold coins like singapore lunar 1 oz gold proof coins easier to sell ?