What food does not exist to do is provide traders with something to do. So, don't go about this thinking in terms of 'what can we do to give traders something to do.' Traders are an addition to the food system, they are meant to support it; they are not a fundamental pillar of it, it does not exist to support them.
Actually, it's not one-sided in either direction. Traders and food/trade are interconnected. They support each other and at least in part exist for each other.
