looks like we need something like banker's rounding for time based exchange.
seriously though, if it were found that people organically produce cyclical values of traded commodities (even tiny variances) would that not be a perpetual money making machine? and isn't that kind of the point to all the analysis business schools teach? find these patterns and exploit them? or is that graph not organic, rather evidence of the actual fraud they were committing? and if so, shouldn't there be some statistical bot looking for these kinds of shenanigans?