I would add that cows (or whatever other animals in the farm) don't have any idea about saturdays, sundays or hoilidays, they want to be fed (and in the case of cows need to be milked) every day, sun, rain or snow.

And it is not so ancient (medieval) as it may seem, it depends a lot on the country and the actual area.

I am told that the family (a very large one, composed of some thirty-forty people) of my great-grandfather (born in 1860 or 1861) lived in a farm (near but not so near to a village) in a remote area of the Apennines and they made one trip each year (with a horse carriage) to a village some 60 km away, on the seaside, to buy salt.

Besides that, all they actually bought "outside" were matches and some kerosene (or lamp oil), some steel/iron tools and glass and clay tableware, all the rest, including furniture, soap and candles was created/manufactured in the farm, including shoes[1] and clothes (they had wool, linen/canvas, leather) .

An older brother of my great-grandfather was semingly the first one to buy (circa 1865 or so) a rifle to go hunting, so you can add to the list gun powder.

[1] what was used largely at the time in farms were wooden clogs (or barefoot) , shoes were reserved for special occasions only