Dogbert does Financial Planning:: applying myth or math?


Dogbert (flaw of large numbers)

Regulators want big, complex banks to hold larger buffers of capital to protect the financial system.

Big banks argue this is unnecessary because risk is diversified across their larger balance sheets.

Who is right? Natural sciences – especially epidemiology, ecology and genetics – provide clues…

 Complex systems: The FLAW of large numbers.

A “law of large numbers” is one of several theorems expressing the idea that as the number of trials of a random process increases, the percentage difference between the expected and actual values goes to zero.

If you REALLY want to get a deeper understanding of probability – and why it is wrong to assume too much from independent events (e.g. the roll of a dice) and apply that knowledge to the real world of inter-connected, non-linear systems – PLEASE check out the “Physics Envy…” presentation by Andrew Lo (link below).

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