  Buy low, sell high is one of the basic rules of thumb used in investment,
although it is not considered to be a beneficial strategy. In this paper, we
show how the appropriate permutation-based representation (i.e., the epistemic
form) of a minute-by-minute trading time-series, alongside the use of a simple
decision heuristic (i.e., the epistemic game), may surprisingly result in
significant benefits. Using our heuristic for selecting seven stocks, we ran
two experiments on the data. The results provide empirical support for the
possible benefit of using simple decision models in investment, even in the
context of minute-by-minute trading.
