The best way to create jobs is to identify a need. In every country there is a need for some or other service, and the more you deliver that service the more needs arise from the 'prior step' in the chain. This means that commerce should be developed and then the need will arise for services or products from there, or, start with the materials.
Any investor would be wise to satisfy the commercial side of the spectrum, as that is the fastest growing one. Also nobody likes to get thier hands dirty nowadays!
So, if you are an investor looking for long term performers, look just below the commercial side of things in the 'pyramid'. Or, i that seems satisfied, aim for the tier just under that. Don't supply a need for consumers, supply a need for business!