From a standpoint of economic efficiency, there are no objections to the advancement of such social policy objectives as long as they are pursued in a market-compatible way, for instance through lumpsum transfers in the form of energy vouchers rather than through wholesale price reductions. Theoretically, a marginal increase in the security of supply - a reduction of the risk that consumers will experience physical interruptions of energy flows or extreme price volatility - should be equated to the marginal cost of achieving this increase. Only with theoretically unlimited willingness to pay could all security of supply risks be avoided, for instance, by installing systematic storage and back-up.