One result of this has been that the Commonwealth has been able to make grants to the States on terms so specific as to amount to the virtual takeover of particular fields of competence. For instance, although the Constitution gives the Commonwealth no express power over education, by means of "tied grants" it has in fact become paramount in the field of tertiary education. Although any state has the option to refuse a grant, the consequences of doing so make this unattractive. Similarly, the Commonwealth has become dominant in the field of public hospitals, and a major player in the field of roads and other major infrastructure.