Investors may find it difficult to buy after prices have risen from their lows and miss the boat entirely, said one analyst. SINGAPORE: Stock markets have been on a rollercoaster ride this month. First, indexes around the world fell and fell again after United States President Donald Trump announced tariffs on all goods entering the country, and heavier levies for goods from certain countries. Then, the president said there would be a 90-day pause on the higher tariffs on all countries except