Future Fund Managing Partner Gary Black pegs the difference between Rivian Automotive Inc‘s (NASDAQ:RIVN) deliveries and production numbers in the fourth quarter to be likely due to its bumped-up delivery van production. What Happened: On Tuesday, Rivian announced the fourth quarter production of 17,541 vehicles and delivery of 13,972 vehicles. For the full year, the company produced 57,232 vehicles but delivered only 50,122. Black attributes the difference to Rivian’s scaled electric delivery van (EDV) production instead of lowered demand for its R1 vehicles. “Amazon can only take so many del…