A 2007 EUR/JPY news shock as a Fibonacci retest drill

The first bounce after the shock

On 17 August 2007, euro versus Japanese yen dropped more than 300 points in one hour after the Nikkei fell more than 800 points. In this archive article, euro versus Japanese yen is used as a risk-appetite carry-trade proxy.

After a large economic surprise, the first bounce is more often a retracement than a genuine reversal. That first counter-move is a news-retracement: the first counter-move after a large surprise, often inventory-driven rather than a trend change.

Measure the news impulse

Strongly positive or negative news can keep influencing currency prices beyond the first print, so the follow-through is treated as a continuation problem rather than a finished event. The working swing is the immediate downswing that followed the shock.

TradersWeek editorial framing treats that measurement as the first classroom step, taken before the bounce is graded as a pause or a reversal.

Grade the 38.2% stall

In that session, price stalled at 153.58, the 38.2% Fibonacci retracement of the immediate downswing. A Fibonacci retracement of a news-driven swing is used to test whether the first bounce is a pause or a reversal.

TradersWeek editorial interpretation: the stall is graded as a failed news-retracement, not as a sign that the shock move had reversed.

Stage the retest and the projection

The first measured objective was a return to the 151.93 low printed at 07:00 that day, framed as a double-bottom style retest of the breakdown extreme. Double top and bottom is treated here as a retest of the shock extreme after an abrupt fundamental change.

A Fibonacci projection of the original down segment carried price beyond 150.38, the 138.2% extension of that swing. A Fibonacci projection of the original impulse is used to map continuation beyond the first retest. News-driven continuation can outrun a simple double-bottom retest, which is why a 138.2% Fibonacci projection was used as a second measured level.

One staging plan used two units: cover half at the double-bottom retest, move the remainder to breakeven, and leave the rest toward the 138.2% projection.