Buffet falls from grace every few years. But this is not a good article. The problem with derivatives and retrospective changes is that this messes with agree

Buffet falls from grace every few years. But this is not a good article. The problem with derivatives and retrospective changes is that this messes with agreements that have already been made. Not only is that not right but it may have consequences that are unforseen. Berkshire and others are correct to insist that they have rights here that should be protected. I understand that the US Constitution is truly on the way out but it did have this bit : "No State shall ... pass any Bill of Attainder, ex post facto Law, or Law impairing the Obligation of Contracts..." I'm pretty sure that used to be taken to mean the federal government wouldn't do it either, but then that can't be reconciled with minimum wage laws either. Maybe that's all uncertain but I'm confident the article is relatively thoughtless.