It looks like something has to give in global markets. : Stocks and bonds around the world have rallied atypically together since the start of the year, rewarding investors both bullish and bearish on the direction of global growth. The main catalyst for the gains was the Federal Reserve’s surprise decision in early January to pause its tightening policy, after four interest rate increases in 2018 raised fears it was being too aggressive as the economy cooled and inflation remained minimal. Those fears helped send global markets into a tailspin in December.