billion -- today, according to the calculator maintained by the blog Don't Quit Your Day Job.

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(In this scenario, Trump doesn't quit his day job. The calculation above does not include any allowance for living expenses, so if he had put all his money in index funds, he would have had to live off the dividends or find some other source of income.)

Trump disputes the independent appraisals of his wealth by Forbes, Business Week (now Bloomberg) and others. He says he is worth about $10 billion today.

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Using Trump's preferred estimates of his wealth, he has still performed worse than our hypothetical Main Street retiree. He told The New York Times he was worth $200 million in 1976, an amount that would be worth $12 billion today.

"That a purely un­man­agedA group calling itself 'Bougainvilleans United Against Mining' has re-stated its opposition to a resumption of mining at Panguna.

Photo: Supplied

The government in the autonomous Papua New Guinea province wants the huge copper and gold mine re-opened to give the economy a lift ahead of the independence referendum to be held in 2019.

Bougainville's Mining Minister Raymond Masono this week applauded a joint resolution by ex-combatants to back the re-opening, but one of those praised by the minister, a former Bougainville Revolutionary Army commander, James Onartoo, said he and his group do not support it.

Mr Onartoo said their group, which includes many women, landowners and ex-combatants, will not support Panguna being re-opened, or mining anywhere on Bougainville.

Members of the group joined a blockade that stopped the Autonomous Bouginaville Government (ABG)