One way of facilitating this demand has been the introduction of trading-at-settlement (TAS) orders. TAS allows market participants to buy or sell relative to the daily settlement price before that price has been determined. Over the years, TAS has been associated with several efforts to artificially influence the settle. Exchanges respond to these signs of manipulation by stating that such trading activity will be subject to disciplinary action. But why does an exchange even offer an order type that at the very best can be used as a tool for market participants to walk away from their responsibility to negotiate a fair price?