Communist versus capitalist cavemen, a story.

The left is understood to be oblivious to fundamental physics (and economics).  This tale is intended as a brief, simple lesson to explain why communism doesn't work:

Two Paleolithic hunter clans live close to each other  in what today is known as the Neander valley. Their respective leaders.  Grok and Hunk, have cave-comunes.

Cavemen discussing politics

Grok, capitalist by nature, has his hunters spend all their efforts hunting for meat, limit their hunting expeditions to no more than two days' march because the energy spent dragging a dead deer back to the cave exceeds the energy they will get from the meat.

Hunk, on the other hand, is a proto Marxist caveman, doesn't get the idea, and allows his men to hunt up to four days away.

Over time, Grok's clan grows healthier and their children are bigger. Hunk's people, on the other hand are skinny, their children are runts.

Hunk, being a proto Marxist,  starts organizing auto criticism sessions, to have hunters reveal their failure to return with as much meat as needed. He also prepares a five year plan which requires 5 %/year increase in meat catch and a reward system to have a "hunter of the year", whose prize is a cap with red feathers.

The plan fails, and hunters try to abandon Hunk's cave to move to Grok's clan. This forces him to assign 5%  of the clan population to serve as snoops and guard their borders to prevent escapes. The plan fails when the two largest hunters manage to get away with their families, and the remaining hunters kill Hunk, and replace him with Orc, a proto capitalist like Grok.