Jennifer is the portfolio manager of a bond fund is considering the acquisition of an extremely complex bond issue. It is complex because it has multiple embedded options. Jennifer wants to estimate the interest rate risk of the bond issue so that she can determine the impact of including it in her current portfolio. She contacts the dealer who created the bond issue to obtain an estimate for the issues duration. The dealer estimates the duration to be 7. The portfolio manager solicited her firms in-house quantitative analyst and asked him to estimate the issues duration. He estimates the duration to be 10. Provide an explanation as to why there is such a large difference in the issues duration as estimated by the dealers analysts and the firms in-house analyst?