Not irrational, Ivanovich - unexplained. I have a model that takes into account resource prices (heavily weighted for oil) and interest-rate gap. It worked beautifully in 2006, not so beautifully in the last few months. Conclusion: my model is incomplete.
My theory on economic data was this: expansion in an exporting economy means (or is fueled by) greater inward capital flows and a rising currency; expansion in a importing economy means greated outward capital flows and a falling currency. I correctly predicted USDCAD last year because I understood that 13 straight interest rate increses by Greenspan were meant to slow the US economy down: that would reduce their trade deficit and push the dollar up (against the loonie: at the same time it should have pushed equities down and discouraged financial inflows, leading EUR and GBP to rise against USD. There's a difference in behaviour again between trade-based and investment-based international money relationships.)
Well, the US economy has cooled off, deficits have dropped, resource prices have fallen, and USDCAD did go up, reaching 1.17, as my model predicted. After that, I had no clue what it was going to do, because US equities weren't doing at all
what I thought they would, and the Canadian economy wasn't
being noticeably slowed down by the drop in trade. So I took February off trading altogether, while I reassessed, and then in March, instead of trying to predict what individual currences were going to do, I took the broad portfolio approach, making small bets in many pairs, setting modest targets, and I did quite well at it: 31% in March, 13% in April. Then in May I let things get unbalanced, put way too much long on USDCAD, hedged against USD weakness but failed to hedge against CAD strength.
Live and learn.
Thankfully missed most of the big slide, which happened during
my "balanced portfolio" period. I made a few futile attempts to catch turnarounds and lost some money in the process, but mainly in that period I was on EURUSD and USDJPY, and doing quite well, thank you.
OK, so new model: currency values work on a feedback loop. A weak loonie is good for the Canadian economy - promotes manufacturing exports, offsets the drop in resource prices - but a strong Canadian economy is bad for the loonie. So I think we're at least temporarily caught in a cycle, maybe 6 months long because it takes a few months for things to work their way through the system, of strong data -> high loonie -> (eventually) weak data -> low loonie -> (eventually) strong data, and so on.
Underneath it all, the loonie is still a resource-based currency, resources are way overbought and are bound to correct, the US economy slows while the equities markets roar; the housing market slumps; conservative investors switch out of mortgages into high-risk investments like resources and unsecured credit: it's a classic hard-landing scenario, like 1929, 1987 and 1989.
My birthday (October 24) is a classic day for a crash: I think I'll make myself a present of some Put options, just in case.
In the medium term (6 months-2 years), I still see a US recession cutting resource prices and trade deficits and pushing USDCAD up, maybe not to 2001-2002 levels, but over 1.20, anyway. In the short term, it will loll about below 1.10 while it waits for the economic data to reflect the fact.
My GBPCAD short has made me $2300 in the past 8 hours - hey, it pays the rent. The British political interregnum theory also looks good looking at EURGBP, which zoomed after May 10.