Justifications for punishment include retribution and deterrence. Depending on how much importance you assign to each of those the appropriate policy will vary

Justifications for punishment include retribution and deterrence. Depending on how much importance you assign to each of those the appropriate policy will vary. If you care about deterrence but not retribution you really might not need as long an incarceration. Your average inside trader might be just as eager to avoid a month in jail as your average burglar is to avoid a year. I'm not saying that's necessarily the case. But it's something to consider.