Yeah, the social upheavals caused amortized good food would be drastic. ell they would even in today's society.

And yes, 3.X does have Creation spells, and fabrication spells, though I believe complex items require skills. But the effect on manufacturing would be dramatic. As would the "Wall of Stone" spell.

And never mind the moon. Greater Teleport would allow quick travel anywhere in the world. And anywhere two cities are connected by a teleport portal, sailing ships and caravan routes would be obsolete. Step through the portal in Florance, walk out in Beijing.