Amazon’s plan for more than 1,000 same-day fulfillment centers is fundamentally an attempt to close Walmart’s long-held proximity advantage, Bank of America analysts wrote in a research note.

Business Insider reported this week that Amazon is considering an internal project called Mercury, which would expand its same-day fulfillment network from roughly 85 facilities today to more than 1,000 by 2031. The goal is to place inventory within 10 miles of about 80% of Prime members in the US, according to internal planning documents reviewed by Business Insider.

BofA analyst Justin Post said Project Mercury’s strategy is less about expanding…