eh... how does that work?
duke taxes lords, ruler taxes dukes. no good reason to have a separate tax structure bypassing hierarchy just because it's food.
and if you have that, you'll reinforce city lord = duke mindset which is bad. because every man and dog will have duke+city lord tax rural lord and skip trading altogether.
and the other thing is... doesn't really make sense to have food taxed once a gold tax, as opposed to everyday. (though it would encourage those with large stores sell it quickly)
Firstly that assumes that you allow food tax rates to be high enough to replace regular shipping.
Secondly there is no reason that food taxes and gold taxes would need to be collected at the same time
I do agree it could encourage the mindset of Duke must be the City Lord. I'm not really sure how prevalent that mind set is at the moment, so it could be that it is so wide spread little would change. I can think of ways to avoid this problem, but they would also result in increased complexity.
