A computer-implemented method for analyzing a risk offset associated with a portfolio including a plurality of products traded on an exchange is disclosed. The method includes comparing a first market response of a first product in the portfolio with a second market response of a second product in the portfolio where the first and second market responses result from a change in market data, calculating an offsetting effect between the first market response and the second market response where the first and second market responses are substantially different responses to the same change in the market data, determining a diversification spread based on the offsetting effect derived between the first product and the second product, calculating a diversification spread credit based on the determined diversification spread, and adjusting a margin requirement for the portfolio based on the diversification spread credit.