Comment by jwmhjwmh

I think the orthodox Marxist position is that prices gravitate around labor values in a competitive market. The main reason for profit is that people can produce more value than is necessary to sustain themselves, so capitalists don't need to pay them for the all the value they produce. Some of the value produced becomes profit. It is true that the rate of profit falls over time, but I think this is because of increasing automation in the economy, increasing the proportion of dead labor to living labor. Capitalists have less and less living labor to profit from relative to their costs of production.