The investment seeks achieve a positive, inflation-adjusted rate of return over the long term. The fund provides a diversified investment program by allocating assets within the following ranges: 15% to 70% of assets in US stocks, 5% to 70% in international stocks, 5% to 50% in bonds , money market instruments and up to 20% in real estate securities and 0% to 20% in precious metals and minerals securities and other alternative investment strategies .