Supermarkets

What is it about
holding, comparing, picking
from two different
jars of black olives
carrying different names
but arguably the same olives
and usually priced
somewhat similarly
that makes you feel like
you're in control
as opposed to
telling the shopkeeper,
"I want a jar of black olives"
and being handed the one
you probably wouldn't have
picked, yourself,
but can't say why?