Preferential independence

'The preferencese at any given time may be dependent on what consequences recently have occured. (...) Specifically, attributes measuring impacts in time period t are not preferentially independent of those measuring impacts in time period t - 1. The general reason is that the level of impacts in time t and the change from t-1 are concerned with different fundamental objects'

Keeny, R.L. 1992. Value-focused thinking. Cambridge. Massachusetts. Harvard University Press, 173.