In mathematical finance, a risk-neutral measure, also called an equivalent martingale measure, is heavily used in the pricing of financial derivatives due to the fundamental theorem of asset pricing, which implies that in a complete market a derivative's price is the discounted expected value of the future payoff under the unique risk-neutral measure.
Read more about Risk-neutral Measure: Motivating The Use of Risk-neutral Measures, The Origin of The Risk-neutral Measure (Arrow Securities), Usage, Example 1 — Binomial Model of Stock Prices, Example 2 — Brownian Motion Model of Stock Prices
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“Both the man of science and the man of art live always at the edge of mystery, surrounded by it. Both, as a measure of their creation, have always had to do with the harmonization of what is new with what is familiar, with the balance between novelty and synthesis, with the struggle to make partial order in total chaos.... This cannot be an easy life.”
—J. Robert Oppenheimer (1904–1967)