The excess volatility puzzle explained by financial noise amplification from endogenous feedbacks.

ABSTRACT: The arguably most important paradox of financial economics-the excess volatility puzzle-first identified by Robert Shiller in 1981 states that asset prices fluctuate much more than information about their fundamental value. We show that this phenomenon is associated with an intrinsic propensity for financial markets to evolve towards instabilities. These properties, exemplified for two major financial markets, the foreign exchange and equity futures markets, can be expected to be generic in other complex systems where excess fluctuations result from the interplay between exogenous driving and endogenous feedback. Using an exact mapping of the key property (volatility/variance) of the price diffusion process onto that of a point process (arrival intensity of price changes), together with a

SUBMITTER: Wehrli A 

PROVIDER: S-EPMC9640597 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature