Personal Finance & Money Asked on August 18, 2021
My question applies only to cross currency pairs. As an example, imagine my home currency (the currency I am buying with) is USD, and I intend to buy 5 units of the EUR/GBP currency pair. To keep the example simple, let’s also assume zero-spread trade and no commissions whatsoever.
In order to do this, I have to first convert my USD to GBP using its exchange rate. Let’s say, at the moment the order takes place, the GBP/USD exchange rate is 1.39853 and the EUR/GBP exchange rate is 0.86063.
5.00000 EUR -> 4.30315 GBP -> 6.01808 USD
I need to spend 6.01808 USD to buy 5.0000 EUR.
A day passes by and I decide I want to sell back the 5 units of EUR/GBP I previously bought. The EUR/GBP rate has gone up by 2 pips at the time the sell order is put, landing at 0.86083, but the GBP/USD rate has gone down by 15 pips, landing at 1.39703. Using the new rates, the conversions look like this now:
5.00000 EUR -> 4.30415 GBP -> 6.01303 USD
As seen, even though I made a profit from the cross currency pair, as I got back more GBP than I initially spent on the trade, I actually ended up at a loss because the GBP/USD rate went down much more than the EUR/GBP went up, leading to a 0.00505 USD loss.
I would like to know if my example makes sense and if this is a real issue when has to take into account when doing cross currency trading.
Yes, as you're exposed to two currency pairs: USD/EUR and EUR/GBP. Absent any trading costs/arbitrage opportunities, this is the same as trading USD/GBP directly.
While EUR/GBP can go up or down, you'll still need to convert your P&L into your reporting currency, which is USD. This really isn't any different from using USD and buying FTSE shares in GBP or DAX shares in EUR.
Unless you assume the EUR/USD exchange rate is fixed or somehow lock it in, you can lose from those fluctuations as well.
Correct answer by 0xFEE1DEAD on August 18, 2021
In the scenario described, you are not actually trading the EUR/GBP pair. You're simply long EUR; this is implicitly with respect to your home currency, USD. (GBP plays no role in your trade other than a redundant and wasteful intermediate currency conversion.) To trade the EUR/GBP pair, you should also be short GBP (hold a negative GBP balance, i.e., borrow in GBP).
Answered by nanoman on August 18, 2021
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