@brat: When you talk about landownership using Australia and America, you'll acknowledge that their natives did not truly own the land. They were nomadic tribes who wandered around. PNG on the other hand have specific areas where we lived (hausline) and farmed etc. For us it will be difficult to just move in and dispossess us from our land. Our concept of land ownership is different and our response will be different:)
However, this concept of land of lack of land as a motivating factor for individual productivity is a unique though valid point.
How this idea can be translated to a national context will be a huge challenge.
You will notice that it is becoming somewhat a reality as well given the population growth; land back in the villages is getting scarcer. People are now forced to live in urban areas and rely more on jobs (individual productivity) with the understanding that there really is no safety net back in the village.