On October 7th, 1913, at Ford's Highland Park plant just north of Detroit, a hundred and forty men stood along a hundred and fifty feet of chassis line and did not move.
The chassis moved. That was the change.
Before that morning, building a Model T chassis meant a team walking around a stationary car with a pile of parts, fetching, fitting, going back for the thing they forgot, deciding what to do next. It took about twelve and a half hours. Within a year of the line starting to move, the same chassis took ninety-three minutes.
The men were not working eight times harder. Nobody can work eight times harder. Something else got removed.
What got removed
Walking, partly. Fetching, definitely. But the expensive thing that disappeared from that factory floor was deciding.
On the old floor, every worker was running a continuous background process: what goes on next, where's the part for it, is this the right order, who's already done that side, what am I forgetting. All of that is real work. It consumes real attention. It just doesn't show up anywhere in the finished car, so nobody counted it.
The moving line deleted the entire category. The chassis arrives, your part is at your station, you fit your part, the chassis leaves. There is no next-thing question because the next thing is physically approaching you at a fixed rate. A thousand small choices, gone, and not one of them had ever been the work.
The honest part
We're not going to pretend this was purely a gift to the people on that line.
It was monotonous in a way that had not previously existed, turnover at Highland Park was famously brutal, and Ford's five-dollar day arrived in January 1914 partly because the work was hard to stay in. Taking every decision away from a person for eight hours is a specific kind of cost, and the twentieth century spent a long time arguing about it.
None of which means eliminate all choice. Only that the decisions cost something, and they cost it separately from the work.
Your Tuesday has a Highland Park problem
Nobody has ever opened their to-do list and been handed the next thing. You open it and you're back on the 1912 factory floor, walking around the car — nineteen items, none of them ordered, all of them competing, and a quiet negotiation happening about which one you're actually going to start.
Do that six times a day and you've spent a real chunk of your capacity deciding rather than doing. It doesn't feel like work, which is exactly why it never gets counted, and it's why you can spend an entire day busy and finish with the strange sense that you didn't build anything.
IHC does the ordering before you look. It knows how long things take, how much day you have left, what's due, and what's blocking what, and it puts the right one on top so the question "what now" has already been answered by the time you're reading.
You still do the work. Ford's guys still fitted the parts. You just stop paying the tax on figuring out which part.
Sources: The Henry Ford, Library of Congress, Ford Motor Company.