The researchers were out in the parking lot, and they were counting people as they came in and out of the store, and they noticed that when the volunteers stood in front of both doors, people stopped coming out of the store at all.
Los investigadores estaban en el estacionamiento, y contando a la gente que entraba y salía de la tienda, notaron que cuando los voluntarios se pararon frente a ambas puertas, la gente dejó de salir de la tienda.