/biz/ - Business & Finance

can someone explain this to a 100% retard. i have fidelity account to trade an index fund. the price of the index fund stays the same all day (price P) even though the DOW fluctuates throughout the day. in the middle of the day i say sell X dollars of this stock. it says i will get the "next available price" or whatever. is that the price that i see on the screen when i make the order (price P), or is it the price of when the market closes? basically if I said sell in the middle of the day today, am i getting the price after the -9.9 that happened to the dow yesterday or after the +9.36 or whatever that happened today?