To make money from the sharp fall in oil prices this year, it helped if you weren't human.
These black box funds use programs to follow various asset classes and look to latch on to market trends. So after crude lost 46% in 2014, they were already betting strongly at the start of this year that the trend would continue, largely through oil futures and other energy derivatives markets.
Apart from a modest recovery early this year, crude prices have mostly been a one-way bet and now languish 66% below their levels around $115 a barrel 18 months ago.
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