The Japanese Index Topix climbed to a three-week high with investors speculating corporate earning to surpass predictions and a weaker yen boosting the country’s exporters.

As Markets closed in Tokyo, the Topix rose 0.6 percent to 12,212.36, its highest level since late September, as all but three of its industry groups advanced. The Nikkei Stock Average also gained today to 14,693.57, adding 0.9 percent. With the yen falling 0.4 percent against the dollar, optimism has risen regarding corporate earnings as the companies you haven’t fully priced in a weaker yen can increase their profit projections.