25 research outputs found
Competition of Commodities for the Status of Money in an Agent-based Model
In this model study of the commodity market, we present some evidence of
competition of commodities for the status of money in the regime of parameters,
where emergence of money is possible. The competition reveals itself as a
rivalry of a few (typically two) dominant commodities, which take the status of
money in turn.Comment: 10 pages, 4 figure
Multifractality in time series is due to temporal correlations
Based on the rigorous mathematical arguments formulated within the
Multifractal Detrended Fluctuation Analysis (MFDFA) approach it is shown that
in the uncorrelated time series the effects resembling multifractality
asymptotically disappear when the length of time series increases. The related
effects are also illustrated by numerical simulations. This documents that the
genuine multifractality in time series may only result from the long-range
temporal correlations and the fatter distribution tails of fluctuations may
broaden the width of singularity spectrum only when such correlations are
present. The frequently asked question of what makes multifractality in time
series - temporal correlations or broad distribution tails - is thus ill posed