This is the third in a series of five articles bringing you ideas from Feroz Ansari's national bestseller, The Wisdom and Wealth Solution . Feroz, CFP®, is a portfolio manager at Compak Asset Management and an adjunct professor at the University of California-Irvine. (The Wisdom and Wealth Solution is published by Kiplinger Books and is a national bestseller*.)

The most expensive investing mistakes are often not mathematical. They're mistakes of perspective.

They happen when we mistake a frightening headline for a permanent trend, confuse information with understanding or let the emotional temperature of the moment dictate decisions meant to last decades.

From just $107.88 $24.99 for Kiplinger Personal Finance

Become a smarter, better informed investor.…