Indeed, the economists reckon that analysts making forecasts mostly took their lead from changes in market values.

ECONOMIST: Financial analysis

Where assumptions are weak or become weak over time due to changes in technology or values or market needs poor decisions follow.

FORBES: The Car on the Sidewalk and Other Reversals

Yields and market values of municipal securities may be hurt more by changes in tax rates and policies than similar income-bearing securities that are taxable.

FORBES: Put Intermediate Muni Funds In Your Portfolio's Rotation