Under normal circumstances, the Fund will invest at least 80 percent of its net assets, plus any borrowings for investment purposes, in the equity securities of infrastructure-related companies or derivatives that provide investment exposure to such securities or to one or more market risk factors associated with such securities. For purposes of the 80 percent policy the Fund considers infrastructure-related companies to include companies engaged in the development, operation, and/or management of transportation infrastructure, oil and gas storage and transportation, construction and engineering, communications equipment, gas utilities, electric utilities, multi-utilities, water utilities, independent power and renewable electricity producers, telecommunication services, cable and satellites, marine, road and rail, and equity real estate investments, as identified by one or more widely recognized market indexes or rating group indexes.