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I think you are focusing on the economic side at the detriment of the many other factors. I would find using the economy to determine this would be more of an issue anyway. After all, most societies have sat in an area somewhere between a market economy and local economy, it was a spectrum. Even at the height of the middle ages, there were still markets and many goods were traded through them that had come from far flung places, just being that peasants were largely self sufficient they themselves did not need to involved themselves so much with that other than to sell produce to pay tax, this isn't even unique to the middle ages, there are small villages and communities living like that in places of the word now.
> With little mental gymnastics and shifting emphasis, we could say that starting from renaissance, Medieval Europe wasn't that much medieval.
The renaissance is not medieval but still. Even If you apply that to the middle ages and are only looking at the economy then yes, I don't think the economy is the defining part of feudalism or even that important to it though.