WHAT THE WORKER SELLS IS NOT DIRECTLY HIS WORK, BUT HIS LABOUR POWER, WHICH HE TEMPORARILY MAKES AVAILABLE TO THE CAPITALIST. THIS IS SO TRUE THAT THE LAW[…] SETS THE MAXIMUM LENGTH OF TIME FOR WHICH A MAN HAS THE RIGHT TO ALIENATE HIS LABOUR FORCE. IF HE WERE ALLOWED TO DO SO FOR AN INDEFINITE PERIOD OF TIME, SLAVERY WOULD BE RESTORED AT THE SAME TIME. IF, FOR EXAMPLE, SUCH ALIENATION EXTENDED TO HIS ENTIRE LIFE, IT WOULD MAKE HIM A LIFELONG SLAVE TO HIS BOSS.