In accordance with the principles of the present invention a non-biased, computer-implemented financial instrument electronic trading system and electronic central clearinghouse are provided. The electronic trading system and electronic central clearinghouse operate to provide electronic trading of financial instruments that are non-biased in that the electronic trading system and electronic clearing house address at least one of two effects that result from the difference between variation margin on a cleared financial instrument and collateral posted on an uncleared financial instrument, the first effect being a systematic advantage of being short the financial instrument when there is a correlation between the value of the financial instrument and interest rates, referred to as a convexity bias, and the second effect being a distortion in the financial instrument when an underlying asset value of the financial instrument changes, referred to as a net present value (NPV) effect.