The popular dollar-yen trade, which has fallen out of favor in the recent months, is coming back in vogue, say strategists, driven by the increasingly divergent performance of the U.S. and Japan economies. The greenback surged to a four-month high of 103.15 yen on Wednesday amid signs of a resurgence in the U.S. economy, before settling around 102.79 on Thursday. "Dollar-yen looks to be on the verge of a breakout," Emma Lawson, senior currency strategist at National Australia Bank told CNBC on Thursday. She expects the pair to end the year at 108. (full story)