EL PASO, Texas (Border Report) -- The City of McAllen recently commissioned a study to track shoppers who come to the U.S. from Mexico.

The study involved monitoring shoppers' cellphones in the Mexican border city of Reynosa, and after they crossed the border into McAllen.

The study took place on key shopping dates, like Black Friday and some days leading up to Christmas. Researchers were able to determine where people shop, how much money they spent and how Mexican shoppers affected the local economy, among other things.

In this episode of Border Report Live, correspondent Sandra Sanchez speaks with Belinda Roman, who conducted the study. Roman is an associate professor of economics at St. Mary's University in San Antonio. She discussed some of the results and methodologies to obtain t

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