Your question is very interesting, a bit like a puzzle of stealing concepts. (Three people will go to live in 30 yuan every year, and 5 yuan will be offered preferential activities. The bartender took 2 yuan, and now he is in 2 yuan, 27 yuan, and asked where 1 yuan went), so I read it carefully several times and sorted out the details.

1.2011March 100 lot. The futures price of oil in March 20 12 is 100 USD per barrel, and the spot price (the market price you mean) on that day is not 100 USD. 3. 16 The spot price (market price) you checked is 98, and the futures price is 102, so your futures yield is 2%. Futures and spot are two different systems. That is to say, if you buy physical oil on March 6th, 15, you will get a profit of about 2% when you wholesale it the next day, because futures and spot prices are mainly positively related, and their prices affect each other.

2. Futures is actually equivalent to an appointment or a pre-sale contract. As you said, your rate of return is calculated according to the oil price of March 20 12. It is useful for the prices of the two systems to refer to their respective prices.