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Last time the Bank of Japan raised 0.25% of its benchmark interest rate to
0.50% on 2/21/2007, the unwinding of the Yen Carry Trade took the S&P 500
Index and the Nasdaq down 6% and 7.5%, respectively, in just 8 trading sessions.
As much as the BOJ would like to start normalizing interest rates, it had learned
its lesson from the last rate hike and decided to keep the rate unchanged at
the end of a 2-day monetary policy board meeting on 10/11/2007. So, traders
continue to borrow Japanese yen at low interest rate to buy high yielding Dollar
denominated U.S. Treasuries and equities. And, the Japanese yen remains to
be the weaker currency against the falling Dollar as the rising Dollar to Yen
exchange rate (USDJPY on Chart 1 below) continues to mimic the S&P
500 Index's (SPX) performance.
Although the spread between the SPX and the USDJPY had widened after, and
before (in anticipation of), the Fed's rate cut on 9/18/2007 (gray area on Chart
1), the daily rate of change of the SPX and the USDJPY continued to show
very similar patterns. I use 11-day SMA to smooth out the curves. The Fed's
rate cut gave the stock market (SPX - black curve) a boost, but it exerted
pressure on the Dollar. The Dollar henceforth slumped to one record low after
another. Fortunately, the anemic Japanese economy and its low interest rate
had kept the yen falling at a faster pace than the Dollar. The rising Dollar
to yen exchange rate (USDJPY), and thus the rising carry trade, eventually
narrowed the spread on 10/5/2007, when the SPX set a new intraday high (red
arrow). For now, the lucid uptrend of the USDJPY depicted by the dotted blue
line seems to support the growth of the yen carry trade. However, this uptrend,
as well as the market's uptrend, may come upon some critical tests in the following
weeks.

Chart 1
One critical test is whether the yen carry trade could reverse the falling
SPX daily rate of change (see black curve on Chart 1 above). While the
S&P 500 Index had just made record high, its daily percent price change
had dropped off significantly. This gives the black curve the appearance of
a market top.
Another test should come next week when the USDJPY bumps right up to the critical
resistance level of the Fibonacci 50% retracement at approx. 117.85 (see Chart
2 below). Although 50% is not a Fibonacci Ratio, it does seem to function
quite well as an important technical resistance/support gauge. This 50% retracement
at 117.85 was also where the stock market started its second leg down during
the July-August market correction (see red arrow). This was a strong support
level then. But, when it collapsed in August, it cut right through the 38.2%
retracement level (116.34) and dropped all the way to the 14-month low of 111.57
on 8/16/2007, which coincided with the recent market bottom. This previous
strong support may now become just as strong a new resistance level. If the
USDJPY failed to advance from here, it could retreat to approx. 116.34. And,
if it dropped below this 38.2% retracement, it could spell big trouble.

Chart 2
Cross referencing with the lone action of the Japanese Yen Index further validates
this likely scenario. Chart 3 below shows that the Yen Index had also
just declined to the critical support level at approx. 85 (each Japanese yen
can be exchanged for $0.0085 US Dollar). This was the prior critical resistance.
The yen broke loose from here on 8/15/2007 and jumped 5% in just 2 days. The
yen dashed almost straight up to above 89 on 8/16/2007, the day the S&P
500 hit rock bottom. This type of impressive run-up solidified 85 as a strong
support for the yen. And, the 12-day ROC (Rate of Change) of the Yen Index
almost guarantees an imminent rebound from here. Whenever the ROC fell below
minus 2 (see red circles in the upper pane of Chart 3), the Yen Index
always bounced right back (red arrows). The yen's rebound is bearish not only
for the yen carry trade but also for the exporting country like Japan.

Chart 3
The near perfect mirror image shown in Chart 4 below leaves little
doubt that the yen (gray curve) and the Japanese stock market move in opposite
directions. That's one heck of an incentive to depress the yen and the interest
rates. In any case, just like the USDJPY and the Yen Index, the Tokyo Nikkei
Average Index had also arrived at a critical juncture near 17,500. This was
where the Nikkei took a nose dive on 7/27/2007 (see blue line on Chart 4 below).
17,500 has now become an important resistance that most Japanese traders are
keeping an eye on.
From the candlestick analysis perspective, the last 2 candlesticks on Chart
4 form a Harami bearish reversal pattern. Harami pattern is not a very
reliable reversal pattern, but tonight's Nikkei action (Monday in Japan)
could provide further clarification. If the Nikkei closed lower tonight and
the low fell below Friday's low of 17,280.60, then we'd have a highly reliable
Three Inside Down candlestick confirmation of a bearish reversal. Nikkei
opened higher tonight, but it's falling fast. At the time of my writing,
it's now fallen below Friday's mid-point of 17,361.18.

Chart 4
This may turn out to be a pivotal week for these technical developments to
unravel. It does look like the yen carry trade has quite a few roadblocks to
clear. And, it may not have what it takes to labor through these barriers.
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