As with IEX, and then Chicago adding its own speedbump, and NASDAQ mentioning the idea of older orders being given some special priority over others, "extended price orders", it seems like everybody is looking to offer incentives to those put off by HFTs, frontrunning, and spoofing. Whether it's speedbumps to prevent HFTs, or benefits for "older" orders, how could exchanges be improved upon to be fairer for market participants? Granted, Market Makers are participants as well, but at some competition between exchanges should determine where people want to play.