The government has confirmed that the food assistance payments will stop on November 1 as a result of the ongoing shutdown.

According to a June report from the market research data firm Numerator, Walmart accounts for roughly a quarter (24 percent) of SNAP shoppers’ total spending. Given the estimated $100 billion spent by the government on the program annually—roughly $8.3 billion monthly—this would imply a loss of about $2 billion for Walmart if the benefits are withheld for the entire month of November.