If we now look at what happens to total product between O and O L 1 units of labour and we can see total product rising at an increasing rate, right, which implies our marginal product positive but increases over that range O to L L 1 right, between the the range O L 1 and O L 3 , right, the total product is rising but at a decreasing rate a decreasing rate that implies that the marginal product is still positive, right, but falling .
