The minister was asked by Barbara Angus, of Ernst & Young in Washington, whether he thought there are instances when retrospective approaches are appropriate.
The minister also said in Sweden that retrospective approaches may be able to help in some cases that cannot be solved simply with rules and ordinance.
However, he added that authorities should not try to apply retrospection in rulings by the Supreme Court and other precedents set by the judiciary if it would create a fundamental change.
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