如题：
A book publisher requires substantial quantities of paper. The publisher and a paper
producer have entered into an agreement for the publisher to buy and the producer to supply a given quantity of paper four months later at a price agreed upon today. This agreement is a: (LM1,15)
A. futures contract.
B. forward contract.
C. commodity swap.
B is correct
The agreement between the publisher and the paper supplier to respectively buy and supply paper in the future at a price agreed upon today is a forward contract.
是不是必须有明确说明是在交易所签订的合约才能算future，不管是什么样的交易物？
