Not to over analyze a movie that wasn’t intended to be analyzed…
Oh hell, of course I want to over analyze it! That’s what we’re here for!
So, in this glorious future, all the means of production are automated. Machinery needs little servicing. Even the planes not only fly themselves, but need minimal maintenance. Not completely foolproof as we see the plane crashing. Was that “pilot error” (some moron spilled brawndo on the controls), or a part failure, or lack of enough jet fuel in the tanks? No one will ever know. Because there’s no such thing as competent NTSB investigators in the world.
The food production is probably all automated. With GPS controlled tractors and harvesters, we’re halfway there now. There may be some supervisor farmers who are smarter than the average moron, just by necessity or by living in the country and watching the plants grow, but not by a lot.
But some things still need manual input, like the food machines. Some moron drives a truck and dumps boxes or bags of food into the machines. But since there’s no food, there’s nothing to deliver. So all the workers think “hey this is great!” and do nothing all day collecting a paycheck just the same. Later they complain there’s no food, but they never make the connection.
So, anything automated like deliveries to stores, manufacturing of most items, keeps going on, and will long after the famine kills everyone. The farm machines “know” there’s nothing to do, so they sit. The supervisor farmers just sit around waiting for something to happen, not knowing when or why, but nothing does. Maybe a spark of something in the back of their brains says “hey, last year at this time, the plants were a foot high by now”, but before they can draw a conclusion, it’s time for “Ow My Balls!” on TV.