WASHINGTON — More than 47 million Americans who receive food stamps will see their benefits go down starting Friday, just as Congress begins negotiations on further cuts to the program.

Beginning in November, a temporary benefit from the 2009 economic stimulus that boosts food stamp dollars will no longer be available. According to the Agriculture Department, that means a family of four receiving food stamps will start receiving $36 less a month.

The benefits, which go to 1 in 7 Americans, fluctuate based on factors that include food prices, inflation and income. The rolls have swelled as the economy has struggled, with the stimulus providing higher benefits and many people signing up for the first time.

As a result, the program has more than doubled in cost since 2008, now costing almost $80 billion a year.