If you were to buy oil at a price of $55 and then there was a shortage of oil around the world which in turn increased the price to $58 dollars, you would have made $3.
If you had bought 1 CFD lot, and made $3 on the price movement, this would result in a profit of $3,000. However, in turn, if oil was to fall from $55 down to $54 because there was an increase in supply around the world, you would have lost $1 on the trade which in turn would be a loss of $1,000.
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