Productivity is the
a. key determinant of living standards, and growth in productivity is the key determinant of growth in living standards.
b. key determinant of living standards, but growth in productivity is not the key determinant of growth in living standards.
c. not the key determinant of living standards, but growth in productivity is the key determinant of growth in living standards.
d. not the key determinant of living standards, and growth in productivity is not the key determinant of growth in living standards.