One key thing to understand from Tuesday's reversal

There's a new bogeyman in town: market on close orders (MOCs) which most traders blamed for the big decline in the last hour of trading yesterday. But what are they? Who is buying and selling at the close? Let's take a look. What is a MOC? A market on close (MOC) order is a market order executed at the close. That means the order gets executed at the final price, regardless of what the price ...