‘Can lawful pressures also count? This is a difficult question, because, if the answer is that they can, the only viable basis for discriminatingbetween acceptable and unacceptable pressures is not positive law but social morality. In other words, the judges must say what pressures (though lawful outside the restitutionary context) are improper as contrary to prevailing standards. That makes the judges, not the law or the legislature, the arbiters of social evaluation. On the other hand, if the answer is that lawful pressures are always exempt, those who devise outrageous but technically lawful means of compulsion must always escape restitution until the legislature declares the abuse unlawful. It is tolerably clear that, at least where they can be confident of a general consensus in favour of their evaluation, the courts are willing to apply a standard of impropriety rather than technical unlawfulness.’