As a key summary measure, estimates of the change in the call on OPEC crude and inventories have hardly budged.

FORBES: Oil Not Going To $50 Any Time Soon

The Gini aggregates all disparities, so it is a better summary measure, but it does not tell you where the gaps are growing.

ECONOMIST: Sizing the gap

Then Jerry Brown, California's liberal former governor and now its crafty attorney-general, rewrote the summary of the ballot measure.

ECONOMIST: Ballot initiatives