Acquiring more land can lead to economic growth, so long as it does not lead to over-reliance on one particular commodity. Remember, most commodities are YED inelastic and subject to large fluctuations in supply - not a good thing. Land is also limited in supply so countries with growing populations actually find falling real GDP per capita - the land can only produce so much. It is more important to invest in quality of land such as irrigation or high-yield rice (see capital).

An increase in labour can lead to greater production, so long as there are jobs for the new workforce to do. If not, the same amount of output will be subtracted from an even larger population, making real GDP per capita even less. This is often a problem amongst developing countries. Instead, it is the quality of the labour rather than the quantity that counts ... this is seen in 'capital' below.

Capital is the investment we make into producing other goods. This can be further broken down into

a) Human Investment - how much do you invest in those who invest in producing other goods?!

We have to be careful here. We can have a large labour force but a low human investment ratio. This would mean the quality of our workforce is quite low - a usual problem in developing countries. In fact, if a developing country invested in human investment they would most likely see an increase in economic growth (e.g. if people lived longer) and economic development (as they would have a better quality of life).

b) Natural Investment - how much do you invest in the land that produces other goods?

This does not neccessarily tie in with economic growth. Having good quality soil may contribute to more economic growth but the 'curse of natural resources' means that countries with abundent supply of them often over-rely on them, and as a result fail to develop in other areas. Over-reliance on natural investment can thus sometimes hinder instead of promote economic growth

c) Physical Investment - how much do you invest in machinary that produces other goods?

Developing countries with a large workforce would be unwise to skip straight into using 'capital intensive technology' (technology that does not need much labour) and should instead try and adopt 'labour intensive technology' (technology that needs a lot of workers). This will help unemployment, poverty etc. Developed countries - which have a smaller workforce - should use capital intensive technology. If a developing country invested in capital technology then it may even experience negative economic growth..

Enterprise relies on people who are willing to take a risk and start up a business. The problem is that this relies on human investment, which developing countries have little of, as it is secondary as a priority to survival. With little money for human investment, there is little room for enterprise. A lack of enterprise thus also means a lack of investment... causing a vicious circle of poverty... to be seen later.

Whilst all of the above help create economic growth, we can also speed up economic growth by providing suitable 'frameworks', known as 'institutional factors'. These include

Stable Banking - helps promote saving, which leads to investment and greater growth
Widespread education - allows for huge positive externalities to society. Not only can people take better paid jobs, but they can contribute to stock of capital by inventing new methods of production or enhancing existing ones. Unemployment is tackled, children are taken off the streets and positive 'norms' can be reinforced (e.g. 'it is wrong to be corrupt'). The labour force may also benefit from education - contraception, cleanliness and hygene all help people live longer and have a better welfare. The positive externalities of education are enormous - keep thinking of them!
Adequate healthcare
Good infrastructure
Political stability