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my method is vague and can bring negative marks.
since long run growth of gdp is 5% and labor growth is 2%. Then technology growth rate will or should be 3%.
investment rate is 20% or saving rate.
s/ratio = n+g+d
n=2
g=3
d= i don't know
ratio is s/ 2+3+x
ratio = 20/5+x
so, at max it can be 4% or less than 4%.
Option has 2% , so ...... (a)
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