eurjpy vs eurusd, usually has positive correlation, although not always
Well, sure there is usually a positive correlation between these 2 pairs that each include the euro because the euro is correlated perfectly with itself. For example, if the euro is rising against the yen and falling against the dollar (that is, the correlation has gone inverse), then the dollar must be rising against the yen even faster than the euro is--in which case, you are better off to trade USDJPY rather than EURJPY. But since the USD will not always be rising against the JPY as fast or faster than the euro, in fact not always rising against the JPY at all, there will on average be a positive correlation between these two pairs (or any two pairs) that each include the euro.
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