Not every market is lucrative in the extreme and it can take a long time to recover from being "disrupted". I think it is also a common practice for larger shop

Not every market is lucrative in the extreme and it can take a long time to recover from being "disrupted". I think it is also a common practice for larger shopping chains to dump prices when they open a new location in order to clear out the local competition, so the damage it causes is well understood to be long lasting.