Except, LightRider, even having read that (and several other items of a similar nature, e.g. on Wikipedia), that DOES NOT EXPLAIN HOW IT RELATES TO Bitcoinica. Yup, I'm shouting there to get the point across. So, if you understand exactly how the limit, stop, and trailing stop orders relate specifically to Bitcoinica, please take a couple minutes instead to enlighten me on what exactly I should do if I expect price to drop. We're at "2.47504 / 2.52631" right now, I have $12 of tradeable balance. How do I put in an order so that I benefit if the price drops -- e.g. let's just say $2.40 as a starting point? How much can I benefit off a drop to $2.40 given my current $12 tradeable balance? Those are the questions I'd like explained, and WikiPedia and your SEC link don't cover it after going through them both several times.
If I put in a "Limit Buy", for instance, right now I can say "Limit Buy 20 BTC @ $2.30" and it shows up as an open order. However, I don't have the necessary funds to buy that many BTC, so I don't know what this means. I can cancel the order, though. The reverse would seem to be a "Limit Sell of 20 BTC @ $2.70", on the assumption the price will go up (?). Neither one of these is particularly helpful, as I don't know what Bitcoinica will do if the price reaches one of those values. Does Bitcoinica then give me a position? Do I profit from guessing correctly? I don't know.
So let's go to the "Stop Buy" option. The description says, "Your order is executed when the market price is higher (buying), lower (selling) or equal than your specified price." Okay, so if I put a Stop Buy of 1BTC at $2.80 (as I have already done), that says if the price hits $2.80... then what? I "buy" 1BTC? Or do I now profit $0.30 because I guess correctly that the price would go up $0.30?
I guess ultimately I'm just going to walk away, come back in the morning, and hopefully the price has changed and I can see what happened and go from there. Right now, I've got four orders that "executed" (and apparently turned into positions), which looks like so:
BTCUSD Limit -1.0 $2.4500 Executed @ 2.475 7 minutes ago
BTCUSD Stop 1.0 $2.4500 Executed @ 2.5127 9 minutes ago
BTCUSD Stop 1.0 $2.3000 Executed @ 2.5273 about 1 hour ago
BTCUSD Limit 1.0 $2.8000 Executed @ 2.5274 about 1 hour ago
The result of the above (apparently my limit and stop at $2.45 canceled out?) is a position that says:
BTCUSD 2.0 $2.5462 -$0.14 -2.795%
And looking at that line, I ain't got a clue in Hades as to what it actually means, other than that it appears I'm currently down -2.795%. That would make sense on the one hand: price hasn't moved much and so the spread works against me. In the morning, I'll return and if it goes up, my $2.80 position benefits I guess, and if it goes down, the other positions benefit? Or maybe that $2.80 was put in wrong and so I'm actually hoping it goes down. Whee. Time to go to bed.