I was not acutely aware of this, but is a perfect example of what will happen in severe crisis scenarios: countries will ensure their own survival over others'.

You cannot eat money therefore exporting only works for as long as those supplies are not needed.

The fact that so many developing countries are massive exporters of food and goods while their own citizens are lacking easily disproves this.

"Not needed" by the people of doing the large-scale economical decisions, obviously. There is, of course, some level of poverty where the non-deciding people get fed up (heh) and revolt, but you have to just keep slightly above it, and things will be fine, as the most of the human history shows.

During the potato famine, English landowners in Ireland were exporting food to Britain while the Irish starved to death.