While purchasing fabric in a shop, I questioned an uneven cut and rather than give me that smidgen of fabric, they trimmed an inch off and threw it away......
and then there are the others who would will move their ruler over that inch.
In our Walmart, when they had bolts of fabric, one could purchase any amount from an additional inch on upward. I, many times, asked for that extra inch or two. Rather pay than be without when cutting later.
Other stores will not cut less than an 1/8 yard increments.