The sensitivity report shows that the Allowable Decrease for the Knit Hats constraint is 51, which means that the shadow price for Knit Hats will stay the same if the constraint on the Knit Hats decreases by as much as 51.
The shadow price for a constraint represents the amount by which the objective function value would change for a one unit increase in the right-hand side value of that constraint, while all other constraints and the objective function remain unchanged.
In this case, the shadow price for the Knit Hats constraint is 51, which means that for every one unit decrease in the number of Knit Hats that can be produced (within the allowable decrease range), the objective function value will decrease by 51 units.
If the constraint on Knit Hats decreases by more than 51, the shadow price may change, and it is likely that the shadow price will decrease. However, if the decrease in the constraint is within the allowable decrease range, the shadow price will stay the same at 51.