Japan's government is likely to upgrade its basic assessment of Japan's economy in January for the first time in four months on the back of robust consumption and a recovery in business investment, sources close to the matter said Thursday. They added that Japan's Prime Minister Shinzo Abe's government plans to describe the current economic recovery more specifically in its monthly economic report scheduled to be released Friday, according to Japan's (Kyodo) News Agency.For three months until last month, the government left its basic economic assessment unchanged, saying Japan's economy "is on the way to recovery at a moderate pace."