The boss of the world’s biggest money manager is warning most investors are missing out as stocks march higher, just as under-invested hedge funds are showing signs of breaking ranks. That has triggered a debate on how the rest of the year will play out, given that strategists year-end index targets have already been reached. “If we are right that the global economy is not about to enter an economic abyss, we would have to admit that the risk of a ‘melt-up’ in U.S. and global share prices would rise,” said Sean Darby, Hong Kong-based global equity strategist at Jefferies.