I quote from the first page of India's Economic Survey 2019 (an official document) -
Investment, especially private investment, is the “key driver” that drives demand, creates capacity, increases labour productivity, introduces new technology, allows creative destruction, and generates jobs.
Does investment directly drive demand? If so, how? I can only see investment leading to higher productivity which increases supply and displaces jobs.
If not, is the increase in demand a ripple effect of investment? If yes, what's the connection?