Philosopher and political economist John Stuart Mill laid several foundations for liberal thinking, amongst others with the harm principle: everyone should be given the individual freedom - and not be hindered by e.g. state intervention - to act as s/he wants as long as no other person is harmed by this action. A short insight in his book On Liberty.
This short video by the Khan Academy presents a classic introduction to economic teaching. Starting with the quote by Adam Smith in "The Wealth of Nations" on the invisible hand, it shows how economics deals with the question of the allocation of scarce resources and shortly presents different questions addressed by microeconomics and macroeconomics. It further makes reference to questions of simplification in mathematical models.
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