The resources needed to satisfy all the want of human being are said not to be enough compared to all the want of humans we have many want we would like to satisfy at any given point in time which we may not be able to meet up with due to economic problems.
The word used to describe our "wants" as humans is "Insatiable", which really means our wants cannot be satisfied and it is not just because of economic problems but because "wants" are never ending and if you try to satisfy all you want every time simply because you have the financial capacity to do so, you will end up spending money unnecessarily and will be putting yourself up for financial lack. Every category of people in the society from the poor to the rich have wants, so wants is not just for the poor or does experiencing financial problems.
scales of preference simple is setting our needs in order of priority.
You talk about "needs" here? I hope you know that there is a difference between "wants" and "needs"?