"But what can deter consumers from choosing between a farmers market and a national grocer are the prices. There is a misunderstanding that larger grocers generally have lower prices and more offerings than their local counterparts. But according to a Purdue University agriculture economist study, that may not be entirely true.

Ariana Torres, an assistant professor for the department of horticulture and landscape architecture and agriculture economics at Purdue, has been comparing produce prices from national retailers to farmers markets across six counties in Indiana since 2017. In her 2018 research, she and Orlando Rodriguez, a master's student, found that prices for fruits and vegetables were generally the same, if not lower, at markets than they were at grocery stores."

describe what kind of market structure this is and explain how you know.