Margin Trading | Bitcointalksearch.org

FreeMoney

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Quote from: ptd on December 10, 2010, 06:02:26 PM

Quote from: MrFlibble on December 06, 2010, 07:41:11 PM

Could someone post a worked example perhaps? Including profit, loss and disastrous loss modes?

We will suppose that BTC has deflated to 1 BTC/USD

Suppose someone buys 10 BTC at 2:1 margin, it costs him $5 and mtgox pays the other $5. The $10 dollars is then sold at 1 BTC/USD. Then one of four things can happen:

* The order is fulfilled, mtgox takes a higher percentage of the transaction than normal because he provided margin (but not 50/50 because he took a lot less risk than the trader)
* The price of BTC in USD falls so mtgox automatically sells the order at the current market price, takes the money for his stake and passes the rest on to the buyer (who makes a loss)
* The price of BTC in USD can fall so fast that mtgox is not able to regain his lost capital (this is the only way that mtgox can lose money)

Mtgox has to sent his margin to a level that prevent the third point happening.

Yes, exactly.

And on the point of "falling fast" people should realize that price is not a continuous function. It only exists where there are offers and that means that price can fall through any level instantaneously. So it isn't solved by MtGox giving them priority. The important thing is regular depositors funds aren't used for this without their consent thinking that a large enough swing can't happen or something.

ptd

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Quote from: MrFlibble on December 06, 2010, 07:41:11 PM

Could someone post a worked example perhaps? Including profit, loss and disastrous loss modes?

We will suppose that BTC has deflated to 1 BTC/USD

Suppose someone buys 10 BTC at 2:1 margin, it costs him $5 and mtgox pays the other $5. The $10 dollars is then sold at 1 BTC/USD. Then one of four things can happen:

* The order is fulfilled, mtgox takes a higher percentage of the transaction than normal because he provided margin (but not 50/50 because he took a lot less risk than the trader)
* The price of BTC in USD falls so mtgox automatically sells the order at the current market price, takes the money for his stake and passes the rest on to the buyer (who makes a loss)
* The price of BTC in USD can fall so fast that mtgox is not able to regain his lost capital (this is the only way that mtgox can lose money)

Mtgox has to sent his margin to a level that prevent the third point happening.

mtgox

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Both options and margin trading are on the to do list.

S3052

legendary

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Agree that options would be a great enabler for more trading.

Grant

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Why not, but i fear the high volatility could lead to a lot of trouble. I found it interesting, would certainly try for a few bucks.

But what i'd find much more interesting is if i could trade PUT/CALL options on bitcoin/usd. I see much more usefullness with option trading than margin trading.

MrFlibble

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Quote from: ribuck on November 04, 2010, 06:30:10 AM

Quote from: sturle on November 03, 2010, 11:01:16 PM

The bid will be put automagically by Mt. Gox whenever someone do this kid of trading. The price isn't going to fall below that bid until everything has been bought at that price by someone.

That's not foolproof. If there is a big bubble and it bursts, [...]

If the market is volatile, third parties may spread their BTC purchase offers thinly down to quite low prices... making it more likely there is insufficient depth to cover the trader's loss?

At this point we are beyond my economicsfu, but... if the broker holds some of the trader's USD, is he not better covered for drop in the BTC price? Compared to holding some BTC and trying to sell them in time to avoid loss?

Could someone post a worked example perhaps? Including profit, loss and disastrous loss modes?

kiba

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Quote from: joe on December 05, 2010, 06:30:44 PM

Since mtgox also runs the market, risk can be avoided by prioritizing the clearing of transactions such that buys to satisfy a margin call always go first; and credit is only extended if there is enough collateral for an ask that is already in the system.

The other thing that will finally come into play here is interest rates, so mtgox account holders will now get paid an interest rate for their positive balance.

Sound like fractional reserve banking.

joe

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Since mtgox also runs the market, risk can be avoided by prioritizing the clearing of transactions such that buys to satisfy a margin call always go first; and credit is only extended if there is enough collateral for an ask that is already in the system.

The other thing that will finally come into play here is interest rates, so mtgox account holders will now get paid an interest rate for their positive balance.

mpkomara

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mtgox could not successfully liquidate all accounts with a margin call in a bursting of even a small bubble at 3:2 margining. one should place heavy default premium on mtgox trades (and consider trying to force a default) if he started margining this early in the game.

TTBit

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If you are taking votes, I'd vote 'no' because I think there will be a default at some point, especially if you are thinking 100:1. My guess would be 3:2 ratio would be a good place to start margin.

Suggestion: Post cash on hand and total bitcoins available versus margin cash and btc. This extra info would help a lot, seeing there are an actual 30,000 coins with 200,000 outstanding.

FreeMoney

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Strength in numbers

Quote from: jgarzik on November 04, 2010, 11:54:36 AM

Quote from: ribuck on November 04, 2010, 06:30:10 AM

For those who don't trade on margin, the existence of margin trading tends to exaggerate the peaks and troughs of the market. When prices are rising, it greatly increases the number of BTC that can be bought, causing the price to rise further. When prices are falling fast enough to force liquidations, it greatly increases the number of BTC that are being sold, which depresses the price further. I don't mind this, because it gives me more opportunity to buy very low and sell very high.

I think that's the rub: margin trading dramatically increases volatility.

I see cases where it obviously does. But if someone wants to make a bet that bitcoin will hold above the .15 level they can offer twice as much support if they double up, right? So now it's less likely to drop below .15, but if it gets below .08 it blows out even more. It seems if people's bets and leverage are not correlated it should roughly even out. But I don't know.

jgarzik

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Quote from: ribuck on November 04, 2010, 06:30:10 AM

For those who don't trade on margin, the existence of margin trading tends to exaggerate the peaks and troughs of the market. When prices are rising, it greatly increases the number of BTC that can be bought, causing the price to rise further. When prices are falling fast enough to force liquidations, it greatly increases the number of BTC that are being sold, which depresses the price further. I don't mind this, because it gives me more opportunity to buy very low and sell very high.

I think that's the rub: margin trading dramatically increases volatility.

ribuck

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Quote from: sturle on November 03, 2010, 11:01:16 PM

The bid will be put automagically by Mt. Gox whenever someone do this kid of trading. The price isn't going to fall below that bid until everything has been bought at that price by someone.

That's not foolproof. If there is a big bubble and it bursts, there could be no buyers ever at the liquidation price. But that's a commercial risk that MtGox will need to decide.

I will be very surprised if we ever see margin trading at big ratios like 100 to 1.

Personally, I wouldn't trade on margin because I like to buy after prices drop, rather than being forced to sell at the low price. Sure, the successful margin trader more than makes up for it when prices rise, but not everyone is successful.

For those who don't trade on margin, the existence of margin trading tends to exaggerate the peaks and troughs of the market. When prices are rising, it greatly increases the number of BTC that can be bought, causing the price to rise further. When prices are falling fast enough to force liquidations, it greatly increases the number of BTC that are being sold, which depresses the price further. I don't mind this, because it gives me more opportunity to buy very low and sell very high.

sturle

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https://bitmynt.no

Quote from: FreeMoney on November 03, 2010, 05:49:30 PM

Quote from: mtgox on November 03, 2010, 05:40:22 PM

I wouldn't have to ID you.
Say:
You deposit X BTC.
You open a position for Y BTC/USD.
BTC/USD goes down a little so your position is only worth (Y-X).
I liquidate your position.
Now mtgox has (Y-X) + X which = Y which is the amount of the loan.

The exchange hasn't lost anything so I don't need to know who you are.

I get how it works when there enough bids at the right prices. But how is this guaranteed?

The bid will be put automagically by Mt. Gox whenever someone do this kid of trading. The price isn't going to fall below that bid until everything has been bought at that price by someone. If the price stops there or rises again, no problem.

jgarzik

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Quote from: mtgox on November 03, 2010, 02:48:56 PM

Would anyone be interested in Trading BTC/USD on margin? Like how trading is done on most forex sites?

Short selling would be nice.

FreeMoney

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Quote from: mtgox on November 03, 2010, 05:40:22 PM

I wouldn't have to ID you.
Say:
You deposit X BTC.
You open a position for Y BTC/USD.
BTC/USD goes down a little so your position is only worth (Y-X).
I liquidate your position.
Now mtgox has (Y-X) + X which = Y which is the amount of the loan.

The exchange hasn't lost anything so I don't need to know who you are.

I get how it works when there enough bids at the right prices. But how is this guaranteed?

mtgox

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I wouldn't have to ID you.
Say:
You deposit X BTC.
You open a position for Y BTC/USD.
BTC/USD goes down a little so your position is only worth (Y-X).
I liquidate your position.
Now mtgox has (Y-X) + X which = Y which is the amount of the loan.

The exchange hasn't lost anything so I don't need to know who you are.

FreeMoney

legendary

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Strength in numbers

Quote from: ribuck on November 03, 2010, 05:13:18 PM

Billed the difference and pursued outside the exchange. Certainly not forgiven.

Quote from: mtgox

If your margin balance drops too low all your positions are liquidated

This suggests to me that MtGox would liquidate before the margin is exhausted (i.e. when it drops to some percentage) which gives the exchange some leeway for a further drop in price before the liquidation can be carried out.

I thought so, but that would kind of change the nature of mtgox. He hasn't really seemed into IDing people and such. I guess I assumed he didn't want to and was wondering if there was some secure way of using margin without tracking people down. But maybe he does want to do that.

Options trading could be foolproof in this sense, right?

davout

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1davout

I see.
Thanks for the answers !

ribuck

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Quote from: davout on November 03, 2010, 04:58:55 PM

...so it only makes sense if you re-sell them shortly after, amirite ?

Margin trading only makes sense if the price is going to rise. In that case there's no hurry to sell.

Topic: Margin Trading (Read 4641 times)