explaining why when one choice is made, the next best alternative is not available (trade-off) (for example, if a student chooses to spend their time (resource) riding their bike after school, they cannot go for a swim (trade-off))
explaining why choices have to be made when faced with unlimited wants and limited resources (for example, by compiling a list of personal needs and wants, determining priorities (including sustainability of natural environments) and identifying the needs and wants that can be satisfied with the resources available)
Sustainability
exploring some national needs and wants in Australia and an Asian country (for example, access to water, education, health care) and comparing resource limitations and decisions