Economics SOP help

[hawk054]

in my statement of purpose for ma degree i should answer following queistion

explain yr motivation to study economics and how an economics degree is related to yr carrer goals.

well one thing i know is  - i want to specialise in macroeconomics and want to work in governmental sector

What advice you can give me to stress in my SOP?

Also about university i'm entering - if in a question is not mentioned about why i chose that one and not other, should i mention about it anyway in SOP?

thanks in advance