the principle of equivalent trade

People cannot gain anything without sacrificing something.

You must present something of equal value to gain something.

That is the principle of equivalent trade in alchemy.

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These lines were taken from the anime series Hagane no Renkinjutsushi (Full Metal Alchemist) which aired from March 2003 to February 2004.

Apparently, this principle is not true. People sometimes lose or sacrifice so much without getting a fair trade.

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Image courtesy of ::ANIDB.net::

~^_^~