Rhody Trader
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... So it doesn't make sense to trade a cross unless both factors are moving in the same direction, with exception for carry trade times.
I'm with GJ on this one. Oftentimes I'll trade a cross to stay out of a USD exposure. You don't need both sides of the cross to work in your favor to make money. You only need one side to appreciate/depreciate relative to the other. They are exactly like any other pair, which is why sometimes you'll hear the non-crosses referred to as crosses becaues they are all exactly that.
In addition, from a TA point of view, watching a GJ chart and believing that one watches bulls and bears in action is illusory. The liquidity is in GU and UJ whereas the daily turnover in GJ is less than that in, e.g., USDSEK. Based on BIS figures from last year, so I may get corrected again...but the principle still holds.
The liquidity is where a market maker is willing to provide it. Since you will quite readily find very good dealing rates for GBP/JPY, it's not at all a question of liquidity. What you're referring to is traded volume. You're right that flows in GBP/USD and USD/JPY are the bigger drivers in changes in GBP/JPY than straight action in the cross, but that doesn't alter the analytic landscape at all in terms of TA.
Do you change your methods from stock to stock because one trades a lot less volume than that other? You shouldn't. It's the same in crosses. They do trade outright themselves, which supports their quotes, as well as having knock-on effects into one or both of the legs. The quote level of GBP/JPY represents what the market believes the fair relationship between those two currencies to be. Thus, to say that you're not properly seeing bulls and bears in action in the movements of a cross is incorrect.