TOKYO — The Nikkei Stock Average rose for a fourth straight day in the Tokyo Stock Exchange on Thursday morning, hovering above the 35,000 yen mark, the highest level since February 1990. Tokyo shares were buoyed by the weak yen and gains in high-tech stocks in the U.S. stock market on Wednesday.

The stock average gained more than 600 yen in morning trading. In addition to semiconductor shares, high-dividend stocks continued to be preferred. Some market participants believe that the newly overhauled Nippon Individual Savings Account program, a tax-exempt vehicle for investing, is helping to lead fund inflows from retail investors.

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