Big Biden Blunder Act or the BBB Act This bill requires the Government Accountability Office to conduct a study on the economic effects of withdrawing U.S. Armed Forces from Afghanistan, including whether destroying, surrendering, or abandoning equipment in Afghanistan had any inflationary effect in the United States. The bill also requests that the President transmit a written statement to Congress on the extent to which destroying, surrendering, or abandoning equipment in Afghanistan had any inflationary effect in the United States.