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What is martingle measure with risk free asset in numeraire or stock price in numeraire

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closed as off-topic by JejeBelfort, LocalVolatility, Bob Jansen Apr 16 '18 at 10:45

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Basic financial questions are off-topic as they are assumed to be common knowledge for those studying or working in the field of quantitative finance." – JejeBelfort, LocalVolatility, Bob Jansen
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First of all it is martingale not martangale. Secondly it is numeraire not numerator. It sounds like you need to study the basics of risk- neutral pricing.

A hint would be that the ratio of two asset prices has no expected drift in the appropriate measure. You are supposed to find the implied probability of the up- move and the down move assuming in (b) that the ratio of stock price to bond price has no expected drift and in (c) that the ratio of bond price to stock price has no expected drift.

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