In Prof. Frijters' view, what determines the level of prosperity of a country in the long term? What is your view on this? Attempt to support your arguments with publically available data and attempt to propose some economic policies that you think best promote long-term economic growth and ultimately people's wellbeing.

Prof. Frijters view is that the level of prosperity in the long term is determined by how much a country can produce and how much a country invests in human capital, machinery, technology and buildings etc. 

Question: What publically available data supports this and what policies best promote long-term economic growth and ultimately people's wellbeing?