"This study is still five times below the highest dose at which no adverse effect has been found, " he says.

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And even if QE has no effect on economic growth, it may still be rational for investors to buy equities.

ECONOMIST: How asset prices react to quantitative easing

Negotiations on the export of natural gas are still stalled over price, which is no wonder given the effect of the shale gas revolution on the world market.

WSJ: Review & Outlook: Asia's Great Rivalry