Oil tumbles, loonie and stocks fall amid more Brexit worries

The price of benchmark North American oil retreated almost five per cent Tuesday, while the loonie dropped by almost a cent and stocks tumbled as investors fretted about the British financial system. The price for the August contract for light sweet crude was down $2.39 US to settle at $46.60 US per barrel. On Wall Street, the Dow Jones industrial average shed 108.75 points, closing at 17,840.62, after the July Fourth holiday. The broader S&P 500