The Rate of profit (n.) is the visible surface; surplus-value is the invisible essence beneath it — yet history starts from the surface.
The Rate of profit (n.) can be higher where exploitation is lower: a poor country with a quarter of Europe's rate of surplus-value but little machinery can show a profit rate a quarter higher.
The Rate of profit (n.) falls not because capital commands less living labour but because the dead labour it sets in motion grows faster — the decline is relative, not absolute.
The Rate of profit (n.) does not fall because the worker is less exploited, but because less labour is applied in relation to the capital invested.
The Rate of profit (n.) is the animating fire of production: if capital formation fell wholly to a few giants for whom mass outweighs rate, production would go out.
The Rate of profit (n.) always underestimates the exploitation of labour — and the merchant's share makes the lie still larger.