It's not, a cursory review of the literature would tell you otherwise.
If you want narratives: the introduction of agriculture to human society is a cooperative effort which generalizes labor such that some can provide for the food supply and others can pursue other forms of labor, e.g. intellectual labor. The strictly competitive approach would not favor the establishment of agriculture. Human progress is measured in cooperation; in fact our cooperative nature it is one of the distinguishing traits of humanity and is largely responsible for the establishment of complex society, which was the greatest evolutionary achievement of humanity over the rest of the animal world.
Would the device you wrote your comment on have been possible without a nigh-incomprehensible level of human cooperation?
If you wish to build a society without cooperation, you are welcome to start your potato farm on a free plot of land out west. The potatoes you grow, by the way, were a product engineered by millennia of cooperative bioengineering on the part of indigenous farmers, but feel free to disregard that in your daydreaming.