1. The tables below show the levels of input and output in the production process. In terms of productive efficiency, which method is the most efficient?

Method	Labour	Capital	Output
A	4 units	1 unit	6 units
B	4 units	2 units	6 units
C	3 units	1 unit	6 units
D	5 units	2 units	6 units

(a)

(b)

Method	Labour	Capital	Resource	Output
A	3 units	1 unit	6 units	4 units
B	4 units	1 unit	6 units	4 units
C	3 units	1 unit	6 units	3 units
D	5 units	2 units	6 units	4 units