Finally, let me turn to one issue on which we agree (at last). NassimTaleb points out an important problem, what I would call the "VAR dialectic" issue. If a risk manager imposes a VAR system to penalize traders for the risks they are incurring, traders may have an incentive to "game" their VAR. In other words, they could move into markets or securities that appear to have low risk for the wrong reasons. For instance, currency traders in 1994 could have taken large positions in the Mexican Peso, which had low historical volatility but high devaluation risk. Or, traders exposed to a delta-normal VAR could take short straddles with zero delta (like Baring's Leeson); this position appears profitable, but only at the expense of future possible losses that may not captured by VAR