In Cobb-Douglas production function Q = ALα Kβ
there will be increasing returns to scale,
if
(a) α + β = 1
(b) α + β > 0
(c) α + β > 1
(d) α + β < 1
there will be increasing returns to scale,
if
(a) α + β = 1
(b) α + β > 0
(c) α + β > 1
(d) α + β < 1