Answer:
with the fundamental economic problem of Scarcity.
Explanation:
As per Lionnel Robbins definition, 'Economics is a science that studies human behaviour as a relationship between ends & scarce means, which have alternative uses.'
So, Economics is a social science as it primarily deals with : with the fundamental economic problem of Scarcity.
Individuals, Firms, Households, Government, Rest of the world are important parts of an economy, or economic participants ie decision makers.
However, the core of economics is 'the problem of scarcity, & resultant economic problems' - what, how, for whom to produce. The problems include all the economic participants mentioned above.
