At the close of business on day 1, the futures price has risen to 1100.
At the end of day 2, the futures price has risen to 1200.
Recent cold weather has sent futures prices of natural gas and oil up.
A month later he closed out his long position when the futures price had risen to £66 300.
As of this afternoon, however, the concerns seemed to be having little effect on futures prices.
Futures prices are up about $10 a barrel since the end of June.
The difference in futures prices is then a profit or loss.
But during the same period the futures price has fallen by just 10 per cent.
Futures prices rise too, pulling the spot market behind them.
But analysts predicted futures prices would not go much higher during the next month.