Junk Mail

There is hardly a day that goes by that I don't receive a handful of junk mail. Most comes from banks with credit card offers. All of them contain a postage paid envelope to mail back the credit card application or a request for further information on other products. I wonder what would happen if everyone in the country mailed back the postage paid envelope empty each day. I can imagine the volumes of mail that would be received. If there were something put in the envelope, Every envelope would have to be opened. There would also be a large postage cost associated with a truck load of postage paid envelops. Maybe they would think twice before mailing out so much junk.