(a) General rule.--Each government agency shall require that every contract granting any concession, license, permit or right to sell, lease, contract for or otherwise make available for consideration goods or services to the public in any public facility contains provisions giving the government agency the right to regulate the kinds, quality and prices of the goods and services upon terms and conditions as may be appropriate.
(b) Exceptions.--This section is not intended to apply in any of the following cases:
(1) Where the right to regulate price or quality is vested exclusively in or has been preempted by the United States or any of its agencies or another government agency.
(2) Where the head of the government agency determines in writing that the retention of the right to regulate is not necessary to protect the general welfare.