Your quote is similar to stress is equal to strain within the elastic limit of a given material.I therefor wonder were the breaking point will be if applied to your model?
I purchased a green outer shirt from marks for £35 it was made from recycled material ,later that week I was in another shop and saw a very similar shirt for £13 ,seems there may be a lot of copying going on.
On some food items there is no difference on LDL prices and Marks .So in the end I think where people choose to shop is down to habit ,Marks is a far better shopping experience .
The trouble with all these new insulation systems is that theynot only keep the heat in causing refrigeration systems to run on shorter cycles as heat is taken from the system and recycled back into the room,Proper air conditioning is what is needed if the climate stays as it is.
I should think that with this weather most stores will sell out of their summer clothes.This would leave less old stock in the warehouses to be sold off at a discount.