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The 1/10 is pretty much what could reasonably be taxed from a simpler medieval farmer without them starving.
Also today we do have systems like social security. There are also quite a few things very similar to commons. Roads, parks, public land and so forth come to mind. I am pretty sure, if you created something like common land for farming most everybody would not use it. At least judging by the number of gardens trying to grow food.
My garden is pretty much dedicated to growing food. Well, herbs mainly because it's not big enough to produce a useful amount of food. Also started growing opium.
"herbs"
The very best quality.
Just don't try to live on public park land. They'll bulldoze your tent, sometimes with no notice. Sometimes they'll lie you into a false sense of security saying they will assist you with housing, then remove everything you own before said assistance is provided.
Also today we do have systems like social security.
Not for much longer at the rate things are going.