We were taught in first grade (just to give credit where due) that a big enough food surplus allowed for specialization of labor. So it might not have stimulate

We were taught in first grade (just to give credit where due) that a big enough food surplus allowed for specialization of labor. So it might not have stimulated trade directly, but enabled people to work on things that could be traded, such as artisan goods, smelted metals, and so forth.