What's wrong with this argument?

[z1235]

@Dave_Chappell

The wages that workers get are not higher than the costs of production - by definition they must be less because labour is itself part of the cost of production. So how can they purchase products at a price above this level? Workers only have as much to spend as they have been paid.

Assume that, at the limit, the idiot workers are paid $0+bread+water. Evil capitalists use the resulting hefty profits to buy each other’s products while the workers can’t/don’t buy a thing. How is this a contradiction, or in any way unsustainable? Who says that the workers must be able to buy everything produced?

Z.