Not in this case. You're citing Economics 101 without addressing the situation from the article.

The current primary supplier had a temporary setback caused by a fire in mid-March and operated at reduced capacity, before going back to full capacity in July. Whatever flexibility competitors had to increase capacity with little to no investment was probably captured. A few months of marginally improved prices won't incentivize any competitor to invest. Hard bread isn't the kind of product that can command a big price before customers lose interest.