sentences:  The Northwest Arkansas economy was historically based upon agriculture and poultry.In recent decades, NWA has seen rapid growth and diversification of its economy based upon the big companies based there, Walmart, Tyson Foods, J.B. Hunt, and Pinnacle Emergency Vehicles, while also seeing a growing University of Arkansas and cultural amenities sector.Although impacted by the Great Recession, NWA's economy fared better than most peer metropolitan areas, the state of Arkansas and the United States overall.