Why Is a Banknote Worth Anything?

A banknote costs only a few cents to make, so why can it buy a sandwich? Trust, who makes banknotes, what can shake that trust, and why digital money works the same way.

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Price & ValueBeginner

What Is a Free Trial?

Games and apps often say "try it free". What that means, an illustrative example, and why it's worth asking a grown-up first.

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