"Competing for food" I kind of understand that. But in that case, the people competing (if free) will say "hey, let's work together on this, easier for all of us, if one day I have food, I share, if one day I don't have but you have you share. As a group of smart people. As a tribe-group of friends.
What is that "to compete for work" ? Possible only if people no longer have direct access to food, so they compete to serve a slave master that will feed them. Not even the slave master has direct access to food...
Some who now got to "own" the land have direct access. People are separated and enslave themselves. What does the majority - that owns no good land do ? Read the post above. But it's worse than digging holes, they are turning the planet into trash.
Now only 3% of the workforce works in agriculture in developed nations. What does a tribe do if they find a magical well where there is plenty of food ? Only one well, kind of small, they can't all be near it because there is no room. And this tribe also has a nice truck. Smart people will take turns driving the truck to the well and back to the village. They all get free time to obtain whatever more they want besides food.
Separated slave people will be like us - some will bring the truck, but others will not be allowed to eat unless they waste their lives 40 hours a week producing garbage. And they compete for that "useful job" that "makes them happy".
To compare with Peak Oil :
Not only that but they use what they find in the well to produce trash. More and more trash. To trade for the food some of them get out of the well. And because their numbers are growing, more and more trash and food is produced. And because there is no real need for all the trash - now consuming 90% of what they get from the well, some of them are left with no food ! They are "potential competitors anyway" or they are not working enough ! And because there are more and more people, a competition for the resources in the well begins, a fight to produce more and more trash and a fight about who has access to the resources for that trash they need to make - to trade for food...
Also they are kind of brainwashed, calling the ones not producing trash "useless"
http://www.youtube.com/watch?v=jqxENMKaeCU