Boosted by a Japan-U.S. trade deal, the Nikkei stock index is expected to stay afloat above the 40,000 threshold at least for a while, despite political uncertainty created by the major setback suffered by Japan's ruling parties in a recent national election.The benchmark may soon break its record high by surpassing 42,224.02 registered a year ago, but the market could face a downside risk if long-term interest rates surge further due to expectations of expansionary fiscal measures like a consumption tax cut."With uncertainty over tariff negotiations dispelled, it makes it easier for compan…READ FULL ARTICLE