The U.S. dollar is expected to hold between 154.30 and 157.60 Japanese yen this week. That projection tells you where the pair is supposed to stay contained. What it declines to specify is which boundary draws the first meaningful test, or whether there is any bias toward either end of the band.
A range forecast is a particular kind of market statement. It prices in the extremes as unlikely without saying anything about whether the tape gravitates toward 157.60 or presses back toward 154.30. The case for watching the top of the band is not the same as the case for watching the floor, and the projection itself offers no mechanism to distinguish between them.
The counterargument is structural. Range calls hold until a catalyst breaks them. A corridor set at 154.30 to 157.60 can be pierced in either direction, and a forecast calibrated to the band provides no guide for what happens when it fails. The risk is that positioning anchored to those two numbers gets caught offside if the pair exits the corridor with any conviction.
On balance, the numbers remain the frame. 154.30 is the floor to watch, 157.60 is the ceiling. The line to watch is which boundary the pair touches first, and whether it holds when it does.