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The Nikkei 225 Index, which is weighted more towards Japan's traditional export sector, is up 5.5% since the election was announced. The broad TOPIX index is up 6.2% The yen has fallen by 3.9%, more than 300 pips, and is now trading at an 82 handle for the first time since April.
The main reason for the weakness of the Japanese yen has been the repeated calls for "unlimited easing" by Liberal Democratic Party (LDP) president Shinzo Abe.
The LDP, which governed Japan from 1955 to 2009, is widely expected to be returned to power in the upcoming election. If the LDP wins an outright majority or leads a coalition government, Abe will become prime minister.
In the first few days of the election campaign, Abe made the case for aggressive monetary easing by the Bank of Japan to break the cycle of yen strength and deflation that is pushing the Japanese economy back into recession. Specifically, Abe wants the central bank to conduct "unlimited easing," with the aim of achieving 2% inflation and 3% GDP growth.
Among Abe's most controversial statements was his call for the Bank of Japan to directly finance a new wave of public works spending by directly purchasing construction bonds-off balance sheet government bonds used to fund long-term infrastructure projects considered to be investments.
Construction bonds are obligations of the Japanese government but are not considered to be part of the government's deficit.
"To protect people's lives and keep our children safe, we must implement public works spending and do so proudly," Abe said in a speech reported by The Wall Street Journal. "If possible, I'd like to see the Bank of Japan purchase all of the construction bonds that we need to issue to cover the cost. That would also forcefully circulate money in the market. That would be positive for the economy, too."